Yes, photos would help a lot. Is it not touching all the way around, or just on certain areas? If its the former, then it's probably due to extruding just a little bit less than it should all the time. If it's just in certain areas, then it's probably a belt tension issue causing backlash, which means that the head stops short on some moves.
Also what slicer and version are you using?
Please post some photo, if you want to receive any advice. But it is probably problem with belt tension.
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