I have both the meat and mushroom snack wrap and wondering which one you had?
The meat (lamb IRC) did not totally agree with me but I would describe my stomach as cast iron and it could have been something else! But I would also describe the filling as not hot enough.
The mushroom on the other hand was so hot it was like molten lava which i discovered as i took my first bite and burnt my mouth.
May be worth raising the issue with AC so they can check the heating instructions as it might be a case that both the meat and mushroom wraps are put in at the same time but the meat ones need longer.