diff --git a/packages/phoenix-event-display/src/loaders/jivexml-loader.ts b/packages/phoenix-event-display/src/loaders/jivexml-loader.ts
index 252011fe5..f83d0a191 100644
--- a/packages/phoenix-event-display/src/loaders/jivexml-loader.ts
+++ b/packages/phoenix-event-display/src/loaders/jivexml-loader.ts
@@ -289,13 +289,14 @@ export class JiveXMLLoader extends PhoenixLoader {
           pos: [] as number[][],
           dparams: [] as number[], // Explicitly define the type as number[]
           hits: {},
-          author: {},
+          author: undefined as number | undefined,
           badtrack: [] as string[],
           linewidth: thickTracks ? 20.0 : undefined,
         };
         if (chi2.length >= i) track.chi2 = chi2[i];
         if (numDoF.length >= i) track.dof = numDoF[i];
-        if (trackAuthor?.length >= i) track.author = trackAuthor[i];
+        if (trackAuthor && i < trackAuthor.length)
+          track.author = trackAuthor[i];
 
         let theta = Math.atan(1 / cotTheta[i]);
 
diff --git a/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/collections-info/collections-info-overlay/collections-info-overlay.component.html b/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/collections-info/collections-info-overlay/collections-info-overlay.component.html
index c18240cb8..f12889c28 100644
--- a/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/collections-info/collections-info-overlay/collections-info-overlay.component.html
+++ b/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/collections-info/collections-info-overlay/collections-info-overlay.component.html
@@ -143,7 +143,7 @@
               *ngFor="let column of collectionColumns"
               [attr.data-label]="getPrettySymbol(column)"
             >
-              {{ object[column] }}
+              {{ formatValue(object[column]) }}
             </td>
           </tr>
         </tbody>
diff --git a/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/collections-info/collections-info-overlay/collections-info-overlay.component.test.ts b/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/collections-info/collections-info-overlay/collections-info-overlay.component.test.ts
index ad6b90b65..2ea365dde 100644
--- a/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/collections-info/collections-info-overlay/collections-info-overlay.component.test.ts
+++ b/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/collections-info/collections-info-overlay/collections-info-overlay.component.test.ts
@@ -178,6 +178,31 @@ describe('CollectionsInfoOverlayComponent', () => {
     expect(component.hideInvisible).toBe(false);
   });
 
+  it('should format numbers to 2 decimal places', () => {
+    expect(component.formatValue(1.123456)).toBe('1.12');
+    expect(component.formatValue(5)).toBe('5');
+    expect(component.formatValue(-1.239)).toBe('-1.24');
+  });
+
+  it('should format a track pos array (array of [x, y, z] points) recursively', () => {
+    // Real shape returned for track.pos: an array of points, each an
+    // [x, y, z] triplet - i.e. a 2D array, not a flat array of numbers.
+    const pos = [
+      [0.0025628636759723617, -0.011743023176942868, -0.05242818281548735],
+      [29.50923086259338, -107.72085890394575, -487.4091843499314],
+    ];
+
+    expect(component.formatValue(pos)).toBe(
+      '[[0.00, -0.01, -0.05], [29.51, -107.72, -487.41]]',
+    );
+  });
+
+  it('should format a Vector3-like object as [x, y, z]', () => {
+    expect(component.formatValue({ x: 1.239, y: 2, z: -3.14159 })).toBe(
+      '[1.24, 2, -3.14]',
+    );
+  });
+
   it('should add label to object', () => {
     const mockUuid = '1234';
     const mockLabel = 'testLabel';
diff --git a/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/collections-info/collections-info-overlay/collections-info-overlay.component.ts b/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/collections-info/collections-info-overlay/collections-info-overlay.component.ts
index 601bd2f2b..467f8c61a 100644
--- a/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/collections-info/collections-info-overlay/collections-info-overlay.component.ts
+++ b/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/collections-info/collections-info-overlay/collections-info-overlay.component.ts
@@ -28,6 +28,7 @@ export class CollectionsInfoOverlayComponent implements OnInit, OnDestroy {
     'labelText',
     '_instanceId',
     '_position',
+    'index',
   ];
   hideInvisible: boolean;
   collections: { type: string; collections: string[] }[];
@@ -154,6 +155,31 @@ export class CollectionsInfoOverlayComponent implements OnInit, OnDestroy {
     this.hideInvisible = checked;
   }
 
+  formatValue(value: any): string {
+    if (typeof value === 'number') {
+      return Number.isInteger(value) ? String(value) : value.toFixed(2);
+    }
+    if (Array.isArray(value)) {
+      // Handles nested arrays too, e.g. track `pos`: an array of [x, y, z]
+      // points, so each element is itself an array, not a number.
+      return `[${value.map((v) => this.formatValue(v)).join(', ')}]`;
+    }
+    // Vector-like objects (e.g. THREE.Vector3), which otherwise stringify
+    // to the unhelpful "[object Object]".
+    if (
+      value &&
+      typeof value === 'object' &&
+      typeof value.x === 'number' &&
+      typeof value.y === 'number'
+    ) {
+      const parts = [value.x, value.y, value.z].filter(
+        (v) => typeof v === 'number',
+      );
+      return `[${parts.map((v) => this.formatValue(v)).join(', ')}]`;
+    }
+    return String(value);
+  }
+
   addLabel(index: number, uuid: string) {
     const labelValue = this.elementRef.nativeElement.querySelector(
       `#label${index}`,
diff --git a/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/overlay/overlay.component.scss b/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/overlay/overlay.component.scss
index fe29d84f0..a06242d00 100644
--- a/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/overlay/overlay.component.scss
+++ b/packages/phoenix-ng/projects/phoenix-ui-components/lib/components/ui-menu/overlay/overlay.component.scss
@@ -1,7 +1,7 @@
 .overlay-card.card {
   color: var(--phoenix-text-color);
   background: none;
-  max-width: 85vw;
+  max-width: 95vw;
   font-size: 12px;
   /* Same min-width as overlay.component.ts MIN_RES_WIDTH */
   min-width: 300px;