Every time you get into a suit, it is as if that suit was brand new as in its first time use. Unfortunately, when you save and reload it may be that the game hasn't saved the current suit state, or maybe even damage, but just puts you into a new one instead.
Usually, if you get back into your ship with a suit weapon selected then that selection (maybe not the grouping order) persists for the next time you use a suit. This is why if you use the bomb launcher and get back into your ship without first changing it back again, you can give yourself a fright the next time you try to repair something without checking the suit weapon!

A dog has a master; a cat has domestic staff.