I have been annoyed recently by a bug that started happening randomly. My mini-map would seemingly randomly zoom way in or way out.
I finally figured out the cause. I think this must have started when action camera was added, now that I think about it.
Basically, while not using action camera, and holding r-click to mouselook, the mouse cursor is actually hidden but still able to be moved down to the mini-map corner. While holding r-click, if I move the mouse around where I think the mini-map is and start spamming mousewheel zoomin/zoomout, the minimap moves instead of my main screen.