One issue that I often have is that the filter panel is a bit slow to fully load and I wind up clicking something I didn't want to...
On a list of issues within a project, I have 2 filters favorited: Open and Complete. I tend to keep it set to Open, but on the occasion that I want to see Complete issues, it seems it might be the headings that load slow (Favorited, Saved, System Defaults). I go to click on "Open" to de-select it, and my favorite filters have disappeared - because as I was clicking, the headings finally loaded and I inadvertently clicked "Favorited" and collapsed that heading. Then I have to click again to re-open that heading, see that Open and Complete are now down a bit from where I was clicking and click Open to de-select it and finally click Complete to see the issues I came in to see.
It's quite frustrating to have so many extra clicks