What would cause this to the valve?

Was checking the valves on a '11 with 50 hours on it and found 1 of the exhaust valve stems chewed up. Shim has some marks on it also. Bucket seems fine. Any ideas on what happened?

Valve2.jpg

Valve1.jpg

Edited by CO_Rider

Valve float?

If the valve floated the shim could loosen from the bucket and land on the stem cocked.

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