I'm not familiar with the SCAR but what you have pictured is exactly what happens to ACR's as well. However it will usually only get to a certain point then not get any worse.
I also beleive what you say to be true as the bolt is starting to rotate before entering the lugs, all be it ever so slightly. I also beleive it does the same thing after it's fired, which is starts to rotate before it has disengauged the lugs. So that I guess could be a cam pin issue on both guns. As I said mine looks the same as it did 700+ rnds ago, never got any worse so I just keep shooting it.
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