Oh I get it, he means it's off axis. Looks like it's hanging a bit right of the gun's center, at least compared to the front sight post.
If it's a cheap knockoff mount (like the low quality Chinese ones from eBay) it could be the mount.
If not it could be the receiver (I had a DBOYS metal receiver that needed a lot of dremelling).
Also make certain your barrel is mounted straight, and it's bending slightly to the left.
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