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@Velocio
You should be checking whether the bolts that go through the Cranks and into the Bottom Bracket match the BB in threading, and whether those bolts have any noticeable wear or damage to them.
That really shouldn't happen.
Was the crankset and BB bought new? I find it hard to imagine the wrong bolt is on there unless this is a pieced together conversion and someone found something that fitted well enough at the time.