Visual Issue with Perspective dropdown boxes

When I hover my mouse over a selection in the dropdown box it highlights for approximately 1 second, then the highlighting goes away. This happens to all my dropdown boxes. The system knows where I am selected, but it doesn't show visually. It doesn't break the application, but visually it is frustrating for the user.

What version? Is it in a popup?

We are running 8.1.42, and the dropdowns are not in popups. A little more information is that they are being filled by a Named SQL query, and they are in coordinate containers.