This has been happening to me intermittently for several months now.
I take control of an upwell structure and the fighter controls appear in the upper left of my screen halfway covered by the neocom menu, they won’t drag or dock back into the structure controls. Then, when I release control and undock, my entire ship control set is gone (hp ring, modules, etc) and the structure fighter controls still appear in the top left (inoperable).
Nothing I have tried in game fixes the issue, even relogging doesn’t; I have to force close the client and restart from the launcher to restore fuctionality.