Problem

Hello all
I have a little problem, i don’t know, how explain but i try … happens only if i upload with ngg 10 or more photos in 1 time in same gallery( for be exactly when ngg create second or more page ), i want insert 1 of this like main photo of article or i want make inside article ( i click add media in article menu after ngg e choice from gallery ) .. appear the problem first 10 are right photo, the second page some are good ( first 2 or 3 photo ) the other are a copy of first 3 photo uploaded … for make easy photo id : 1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 3 4 etc
i tried to pull down all plugin and turn on only ngg and make twenty seventeen like themes … but problem remain
can u help me ?

ngg version 2.2.33 ( the last )