The funny part here is that during S6, whenever you changed ships, your BOffs would stay, as would your tray. And when you changed back, you had the same BOffs and tray that you did the last time you used that ship. And never had to swap things around or put BOffs back (like now) unless YOU intended to.
Bug? Maybe. Unintended? Probably. Annoying as hell? Definitely. Unexpected? Not in the least.
(something to note: your BOffs will only become un-equipped if you use the same BOffs on multiple ships)
Probably one of the most aggravating things about this game and here we are 3 years into it, you would figure they could have fixed something like this by now considering most MMOs now come out at release with a quickbar lock feature so your powers will stay where you put them. Considering most of your space powers are class based and the same, other then your device slots and anything else you might pull down from the available powers, you would think they would be able to solve this fairly easily.