Film advance problem with Fuji GX680 III and N III film back

[PyvovarPavlo]

Hello everyone, maybe someone can help me? I have a Fuji GX680 III with an N III film back. When I load film into the back and press the advance button on the back itself, the back advances the film correctly and stops at the first frame. But when I attach the back to the camera and press the shutter button, the shutter fires and then the film starts advancing continuously all the way to the end without stopping. I cleaned all the contacts. All the batteries are new. I disassembled the film back and checked all the sensors. I also replaced the camera body sensor that is pressed by the film back with a new one. The problem did not go away.
What could be the problem?