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The drop down problem you are seeing is more than likely an issue with your browser. Have never seen nor heard of that happening, What browser are you using?
Using Google Chrome. It happens on all my browsers and on other computers I use. I hover over a link and immediately go to another one and it glitches.
Sounds like a set up issue on your end. I use Firefox and chrome on windows and linux and don’t see that. Also never had anyone mention it as an issue.