If you have a table component with the filters enabled, and a container directly below the table, there is some z-fighting between the table filter dialog and the container. When the pointer is within the table, the filter dialog is above the container as expected
However, when the pointer leaves the table or the filter dialog, the container further down the page gets computed a higher z-index and obscures the table filter dialog
This looks like it's because all of the container classes have a specified z-index of 0, and the table has an unspecified z-index, which has unspecified behavior. If I change the z-index to the container of the table 7 in that example, the menu stays on top of the container underneath. Any lower and it's obscured again. I don't know if 7 has to do with how the elements on that specific page are laid out.
