In all seriousness. What size bullets are you shooting? Unless you're using very large bullets it's probably the way you're holding the rifle. If you're leaning into it to much on the bench it my well kick like a mule.
The number one cause of death in the 20th century. 290,000,000 citizens were first disarmed and then murdered by their own governments. This number does not include those killed in war.
We're from the government, we're here to help