The patches that are blown.. are they old? When pre lubed patches get too old, they will blow out sometimes. Also I see you were you shooting Triple Seven. Triple Seven will blow patches, but with a bore button under them it should not have happened.

That rifle's been shot too much to have a ruff bore. Are the ball and patch loading real easy? Sometimes that will let gas slip by and that too will knock a patch all up. A thicker patch or larger ball can cure that.

With light loads, patches should not normally blow. Good shooting there..