AR suppressor problem

Probably Too much and is severely over gassed

^ I'd bet that! You're running the bolt too fast for it most likely.

Could try lower power ammo. Easiest would be to throw a heavier buffer in there and see if it changes.

Adjustable gas block or Adjustable carrier can help/fix too!

Way over gassed. Too much gas can do weird things.
Saw it in a 6.5cm build.

Likely way too much gas.

Can I take too much gas for 500? Jk.

Too much gas. Slow down the bolt

I really do not think anyone can make a decent analysis of your AR issue from only the basic info provided. First off, running a 7.62 x 39 in an AR-15 is (and has always been) temperamental since the 7.62x39 cartridge was made for a magazine that is curved (like an AK magazine), but since and AR-15 has a straight mag well, there's always a magazine and feeding issue because the magazine needs to be straight for the first few inches. Even if a feeding issue does not always present, the situation is temperamental at best with a 7.62x39 in an AR-15. Second, to properly analyze things one needs to see exactly how the jams are occurring and how the cartridges become stuck. Not all jams are the same. I keep seeing posts about over gassing in AR's but, in truth, by their very gas system design, over gassing is almost a non-existent issue in AR's. I can go into this in more detail but out of literally hundreds of AR's I have built up, worked on and test fired (many of them wildcats), I have essentially never seen over gassing to be an issue. Odds are there is something else going on than over gassing.