Something is definitely wrong with your P-07 if the decocker is walking out like that. There have been issues reported with certain models of the P-01 Omega doing that on their own, but I've never heard of a P-07 or P-09 doing it. The ejector is under spring tension and should prevent that from happening. Does the ejector spring back up when you push it down?
You're probably going to need to either remove your decocker parts, left and right side, and inspect them for any possible problems, if you feel up to that... or else just send it into the factory. I remember one person had a cracked cam on his decocker shaft, so things like that do happen occasionally.