This isn't the website I was looking for but it has a good discussion of the issue.
you will need to be familiar with bolt disassembly to further diagnose this one. Have you had the bolt out of the firearm yet? I am not suggesting that tou do that because if it is what I think it is the bolt head will want to rotate and you can't reinstall the bolt without manually rotating it back. Google "m95 dime trick". Worse case is the bolt head will jamb/get stuck while pulling it out of the receiver.