Pipes going to the wrong place

This issue was reported by one of my players:

"when you run the pipes from the trough to the conveyor, they disappear and go to other parts of the base. It's very strange.

But from the conveyor to the composter is okay."

I've attached the screenshot he sent me to demonstrate where the pipe goes somewhere else.

When trying to repeat this on my test server, I can't even get the conveyor on the box to connect to the conveyor. If I click on the input of the conveyor, the pipe disappears and this is on the test server with limited plugins.

Anyone have any idea?