Probably soap grabs the left-up particle first, thats why
now thats some adhesion right there!
ProtoBlast: Atomic2385? I've got to have a "talk" with him! Name copier!
Soap attempts to "grab" an oil particle and raise with it, if there's any oil party in the 3x3 area atomic2385 mentioned. The idea is that soap simulates the effect cleaning products have on oils in reality. That said, this behavior is completely predictable in tpt.
Actually, densities operate on proximity, soap-oil interaction is much different:
here id:1672267 I made it starting with your save. I just wanted to see it it would work. you may copy it as I will probably delete it soon. if you want.