Loosen them off then just barely snug them down finger tight and give the butt a couple of tapps on the floor pushing the barrel back into stock and snug up the front screw first making sure the barrel is centered then the rear.
It is not uncommon for things to settle after a few shots so recheck they are still firm after 5 or so shots and they shouldn't move again.
How clean is it? Could it be copper fouling build up?
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