stripped head bolt

It should have a clear threaded path. Did a bolt possibly break off in there. As far as I know it is just threaded aluminum and no insert.
 
It should have a clear threaded path. Did a bolt possibly break off in there. As far as I know it is just threaded aluminum and no insert.
No, all the original bolts came out clean and intact. So I'm puzzled as to how an aluminum or even an aluminum alloy could strip the end of a steel bolt. Seems like it would be the other way around.
 
It is a odd stripped bolt by looking at it. Maybe something came apart internally obstructing the thread path?
 
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