Think your problem may be with tracking file for these images, have a look at this post by ceroberts75:
You are no doubt already aware that the pictures you take with the camera are in the /home/user/MyDocs/DCIM folder and the pictures (jpg) files you save from email, etc, are stored in the /home/user/MyDocs/Pictures folder.
Symbian specialist until 31/01/2013 with interests in Maemo & MeeGo but an aversion to Windows!
open terminal then do the following commands (each line below is followed with "enter")
then reboot your device???
It is not useful on my phone.
and after I did the above commands, photos that was supposed in gallery is gone now....omg!