Hello kirbster 1,
It might be just my assumption, but I believe the mismatch in the scan results could be the results of the lack of restarting.
Some repairs need a reboot to be completed, before the system is restarted, it will be in a state of "Pending repair". Since you accidentally run another scan in the system, SFC noticed that the corrupted files are not yet replaced and return "can't fix" message.
In this case, can you please try to restart the PC first and run the scan again to see how it goes?
I'm waiting for your reply.