Valve Pipe Direction Issue

[jorgebonafe]

Valve Pipes change direction of liquid travel sometimes. I haven't been able to find out when exactly this happens, but it happened to me multiple times. That is, I will set to extract liquid from tank 1 to tank 2, with the wrench, like this: ( "0" is tank, ">" is valve )

0>0

And sometime later I come back and its reversed:

0<0

The version I'm using is ABO-MC1.7.10-BC6.4-release2.6.4

[jorgebonafe]

I have confirmed this is actually happening when opening the world.