Highest Continuity error in POS

Hello,

My drainage network simulated in Sewergems Explicit solver is consist with Ponds and POS. I'm getting not converging %, more than 5%. It gives unstable flow results. When I check the report summary, it shows higher continuity error in POS. Is there any way to figure our out how to fix this ?. I have tried reducing the simulation time step, but didn't work.

(I'm getting the warning "The composite outlet structure EQT has one or more headwater elevations with reverse flow conditions.  Calculated reverse flow may be approximate", I believe this is not an issue.)

BR

Nishadi