Hi,

Ive the same issue, different entities, different liquid, same behavior.
https://www.youtube.com/watch?v=6vEH9t6S2AY

As soon as the pipes are empty, the liquid switchs.

How does it work if you wanna merge two lines into one with a spliter?
Does the the 2nd (unsued) exit of the splitter overflow on the ground as well?