Shimano caliper not sitting properly on fork (gets angled) 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.
First double check the wheel is fully seated in the frame. If it is, and the caliper is sitting at an angle no matter what you do, it's a sign the post mounts need  to be faced, which essentially is a shop job unless you buy a fairly expensive tool. This isn't common on new suspension forks for whatever reason, although you see it out of the box on frames quite a bit presently. Hopefully whoever you bought it from just takes care of it for you.

A related problem arises if the mounting bolts have been overtightened and caused the post mount or adapter to dent a depression into the surface of the caliper. That doesn't really happen on relatively chunky mounts like these though, more the dainty rounded ones that some bikes use.