Liquid stimulation going through mesh

i stimulated a liquid in a water feature using flow for a liquid emiiter and there are few effectors. everything is fine until the water reaches the edge. instead of falling through the edge it goes right through the mesh… i dont understand and tried different settings and baked data too many times. i just cannot find a solution online… here is a picture to help understand what i mean… i can upload the blend file if necessary…

( notice how the particles fall through the mesh instead of falling throught the edge.) any help would be much appriciated… thanks.

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