I checked this in our demo gallery, and it works fine. This was fixed some time ago ... Are you sure you are using latest version? emptied cache?
Another possibility, is that if you share an image that facebook has already shared earlier, facebook may use its internal cache to display same data as earlier ...
I see, will test that, thanks guys, I think I may not be with the latest version, but previous maybe...too many updates in a short time... not that I am complaining
Best, G