I think others may have mentioned similar issues in this thread, but something odd is going on with squadrons, parasites, and fleets. When a ship with a full squadron detatches from a fleet, oftentimes the parasites are invisibly left behind in the old fleet, while still looking as if they were present in the detatched ship's squadron. This has caused me to delete whole customized squadrons and reload saves, when fleets that appear not to have any ships in the left tab in fact show that they have the parasites from other fleets in the right panel. Image attatched. If this isn't a bug, how do I avoid this behaviour? I don't recall encountering it before, but maybe I'm doing something wrong.
Edit: Oh! Just saw other messages on this same page talking about the same thing. Silly me.
SJW: Fixed for v2.5.1