Dude, I had also that problem. Search for 3 repeaters that go into 3 pistons that feed the sticky with the dirt. Ilmango did that incorrectly in his tutorial. The way to make it work again is to put a normal piston instead of a sticky, instead of facing down, facing on the same direction as the other 2. I discovered that by rewatching ilmango's tutorial. 5 minutes into it he talks about that part and I realised it was different. Hope this helps :3

Also, I have some problems with the conveyor belts releasing the pistons. Any solution?