Is it possible that you really were unaware of bullet setback, especially in the .45acp, if you load the same round into the chamber several times? (As a matter of fact, that's one of the tests to see if your round will set back!)
Do not blame the manufacturer. If you are unloading often (why you would do that I do not know1) then drop your top round to the bottom of the stack so you do not set the bullet back so soon.
1 - your handgun is safest when it remains in its holster. Every time it comes out of the holster you increase the chances for a negligent discharge. You also subject the finish to wear, but some think a handgun with holster wear looks good.