The Stroke Panel Table Cell Stroke picker box is adjusting other Workspace panels in its shared column
My saved workspace has the Stroke Panel at the top of a column of panels and when I create a table and click into it to change its stroke, the Table Cell Stroke picker in the Stroke Panel expands. When I click outside of the table and the Table Cell Stroke picker goes away, the panels that expanded collapse, but other panels below stay in place. If this is done repeatedly, the other panels' locations/sizes would be altered permanently needing the Workspace to be reset.
The video below shows what happens when the above described action is performed multiple times. Note this only occurs with the Swatches/Layers/Pages panels, this does not occur with the Character/Paragraph Styles panels. I have not tested this with any other expanding panels.