Reproduction steps:
1. Open the attached “DualInspectorUITK” project
2. Open the “Assets/SampleScene” scene
3. In the Hierarchy window, select the “GameObject” GameObject
4. In the first Inspector tab, add two Elements to the list
5. In the second Inspector tab, remove those two Elements from the list
6. In the first Inspector tab, add an Element to the list
7. Observe the results
8. Add another few Elements to the list
9. Observe the results

Expected Result: The first added Element is visible and no overlapping occurs when more Elements are added
Actual Result: The first added Element isn’t visible and it overlaps with others when more Elements are added

Reproducible with: 2022.3.6f1_b9e6e7e9fa2d, 2022.3.41f1
Not reproducible with: 2021.3.42f1, 2022.3.6f1_595908758b5e, 6000.0.14f1

Reproducible on: Windows 11 Pro, Windows 10, macOS 14.5 (reporter’s)
Not reproducible on: No other environments tested

Note: On Windows 11 the first Element that’s added isn’t visible (same as other OS), however when more items are added no overlapping occurs and instead all Elements fall into the right place