All I can say is what he said. In one position, the top rams hold more fluid. If you fill in that position, it will blow out a seal in the resevior. He said it was common, and he could tell, and would void my warranty.

Thinking about it, it must hold more fluid in the up position since the ram arms take up space in the down position.

So if you fill while the top is up, then you have over filled the system.