simply unstick the photo.
if you stuck it and never unstuck it and moved it to another category its still sticky
There is no mass unstick you must view a photo and use the photo options stick/unstick link.
Photos are never mass stuck so without knowing what your doing as I posted to begin with I cant say.
when a photo is uploaded there is never a sort set.
Only you as admin can sort photos or if you allow members to have personal albums they can order there album photos but then again they are ordering them so its nothing the program is doing.