That's odd, my models don't interfere with the other models since they are in a different folder, maybe you deleted something from models.dat?
This is what I have inside of my "models" folder. Assuming you did everything correctly and have the folders like this, it should work fine. Check if you have all of the files inside each folder.
yes, i did an alternative folder as you said (the mmodel), after that the models started to not work anymore
What do you mean by "did an alternative folder"? the "MMODELS" folder was inside the .zip of my release, you just have to put the folder inside the main "models" folder, and then add the 3 lines to models.dat