hello, i joined this forum because i need your help. i was shooting with my friend in his farm and everything was normal untill i bumpfire my ak-74, for some odd reason the bullets ended hitting the target sideways. This is the first time something like this happen, i have shot about 300 rounds with it very accurate from 100 and 200 yards, hitting center mass with no problem, untill my last 20 rounds that i bumpfire for fun at 15 yards from the target, and anyone explain why this happen? BTW the rifle is century build