I just bought a new mountain bike equiped with Shimano M365s and RST Blaze fork and I've been through the bedding process.
I noticed that my front brake is rubbing a lot, and when i tried to fix it, I realised that the caliper is not seated straight on the fork. Also, the disk is a bit bent but i suspect that's coming for the hub itself as the bike is brand new.
When i try to center the caliper it sits perfectly on the disk, but when i tighten it, it gets a bad angle and rubs unevenly on the disk.
I suspect it's something to do with the washers as they not sit straight when the bolt is tightened.