I see it. You really don't need a bubble trap after the skimmer. The first partition is enough, then It looks like you are emptying the skimmer into the fuge area, correct? Put that pipe back where the skimmer is.
The third partition (the one after the refugium) will dictate the water height in there, and then the water should be going down under the last partition that is about 1" away and 1" above the one before it. A third low partition is sometimes used, but i don't find it necessary. See if any of that cures the problem.