This is apparently an issue. A number of gun channels still left on YT have talked about it in recent months although I thought Sig did a recall to fix the problem.
Probably why the US Army insisted on a manual safety.
I recall a few years ago when the gun 1st came out there was a drop fire issue. If you dropped the gun and it hit oh just the right spot it would fire. But Sig did a recall and retrofitted the guns. They also modified the design moving forward to eliminate the defect. Maybe these are first Gen models that never got fixed. I’m still skeptical that brushing your hand on the butt could trigger a discharge.