@atlet I think I can see what has happened. Shimano caliper bolts come with 3 washers. The thin top washer is captive. The other two are 'cone' washers to ensure bolt alignment and only to be used at the top. In your photo one of these cone washers is used between the caliper and the adapter. It should NOT be there, all 3 washers should be at the top of the bolt!
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