I’m embarassed to admit that I can’t figure out this problem on my own.
However, I’ve noticed that when I add slicers as dropdowns, occasionally, the items (selections) will be displayed above the slicer in question, overlaying the visual directly above it.
I’ve compared the Visualization parameters for these slicers versus slicers that display the items correctly. I can’t detect a difference.
The only time I’ve seen this happen is when the slicer is added very close to the bottom of the page, and then the dropdown options appear above. I don’t think there’s any remedy to this other than to move the slicer higher on the page.
If you have a counterfactual example where the slicer exhibiting this behavior is higher up on the page, can you please post the PBIX file so we can take a look and see what’s causing it?