Cybergun Five-seveN GBB slide moves back and forward?

[Squidonge]

I picked up the gun yesterday and it was all fine. Now however, when the mag is our, or the mag is in with no bbs, the slide moves back about half an inch very easily. The barrel moves as well so it is the whole top half. I've worked out that the issue is with the forward most spring in the picture, I believe it is meant to hold the catch up to keep it still (unless you want to take it a part). The problem is that I cannot figure out where the spring is actually meant to go. Any help would be greatly appreciated! Thanks.