Ghost Drop Down Squares?

Just noticed a strange snag in how my nav operates. When hovering about a subject title, the nav appropriates as configured, showing a colored panel with content choices underneath. But if you click on a nav heading, and then hover over another heading, the portion of the navigation clicked on displays an empty white box. I’ve searched through every custom class I can think of to see why this might be happening.

Has this happened to you? Any idea on how to fix it?



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