Please help!

Some minor details: I have an album that has 30 subalbums. On the very last subalbum which I just added, I am getting a strange error in which any photo after #20 (this number is probably arbitrary) is mis-ordered and the next page/prev page icons no longer work.

I do have many pictures in there, and I likely have "repeat" names of files due to my large number of photos.

I am using the latest version of zenphoto.. i upgraded to latest nightly build, but the same error appears.

Link to the broken album: LINK

Update: After removing the folder, refreshing the database and metadata, the problem is resolved.