This isn't much of a helpful forum when there's no response!!! I thought there was suppose to be Adobe ppl. here!
Which version of Lightroom are you using?
Please relink your Pictures in your catalog.
Let us know if that helps
This is a user to user forum so don't expect a reply in 4 minutes or even 4 hours.
The ? usually means you did something with the files OUTSIDE of Lightroom such and renaming or moving or deleting.