Issues with generating arrows at with vertical spacing

[sandeepvikram321]

Hello, I am trying to extract some signals from json files and create a sequence diagram (see screenshot).

I am doing this using python to generate the xml.

Problem:

I see the signals are always generated at the same vertical level. (see screenshot)

Can you please suggest what i need to change to evenly space out the signals?

Attached also is the xml code generated.

Any advice will be helpful. Thank you.

xml_snap.txt