Steering wheel turns by itself ?

[kcfirstbuild]

I have a 1968 c10 Lwb with a Ram assisted power steering. I recently rebuilt the ram and the control valve. Here is my problem or maybe its not a problem. I filled up the power steering pump with ATF and started the truck. As soon as i started the truck the steering wheel started to turn by itself. So i took a look and the hydraulic ram seems to be moving and turning the tires and the wheel to the right. I should add, i can grab the wheel and it doesnt turn but then i let go it moves by itself again.

Do i have to re-rebuild the control valve or is that the way ram assisted power steering just is. I'm new to this entire project.