CivilStorm sudden HGL / EGL jump that makes no sense !

Dear sir / madam,

I am using CivilStorm (Implicit SewerGEMS Dynamic Wave solver) for running a storm sewer network and I have realized that specially at the intersection of pipes (2 pipes or more) I do get a sudden jump in the HGL / EGL which makes no sense.

Can you please advise how can I have this issue solved?

Below is a screen shot with more clarity on the issue I am facing:

Even at time zero with almost no flow, still I get this strange jump in HGL/EGL

I have also attached the CivilStrom files for your reference.Using the - Implicit (SewerGEMS Dynamic Wave) - solver 1.zip

Thanks in advance,

Amr