Sounds like a gas issue to me.
As in TOO LITTLE GAS.
The bolt is partially extracting the hot case, and then ramming it back into the chamber.
Anytime you ram a fired case back into the chamber of a gas-operated semiauto rifle, the case is quite likely to become seized in the chamber.
Fix the gas issue, and you'll probably fix the extraction/ejection issue.
Alternatively, you may have a binding issue, which prevents the correct amount of gas from operating the mechanism in the correct manner.
Bent op rod?
+1 on Fulton being able to give the rifle a thorough going-over.
Fulton does really good Garand work, and their prices reflect it.
Spend what you have to to fix it, and don't fret about "collector value."
...or if you don't want to fix it, and you think it is so collectible, sell the problem to somebody else.