You imported 941 photographs. Did you add any to that folder afterwards? If so, you'll need to Synchronize that folder. (Ctrl-click on folder in LR and choose Synchronize.)
Also, there may be items in that folder on disk that aren't photographs, or are photographs in a format that LR can't deal with.
Thank you. I just synced after your reply. Your notion that there may be things in the LR folder that LR cannot deal with is quite possible. It just seemed like a major discrepancy.