thats quite normal. all depends on the gun and barrel harmonics, one of mine have 2" horizontal and 4" vertical.
What you need to check for is consistancy. I had one gun where POI was different each time I removed and re-fitted hte suppressor. I could feel it binding at one point when screwing it on so sent it back to get the internal sleeve bored out a bit. That fixed it.
You need to shoot a 3 shot groups with it on, then remove and shhot anotehr 3 shot group, then re-sit and shoot 3rd s shot group to confirm POI is same.
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