Textures multiplying themselves in the model

i made a ring for a 3d game. rules specify that only 3 textures can be used. which is all that ive used 3. yet when i export the item, and try to add it to the shop in the game, one of the textures have duplicated themselves in the model. i even redid it 4 times to make sure i used only 3 textures. i need help with this, im about to blow up my computer.