This page runs different static rules, to detect in advance some error a process may have during the production.
For example, is all your Groovy script compile correctly? What's happen if all variables are fulfilled with a null value: is your groovy script is robust?
You have a Call Activity in your process. But is the process is correctly deployed?
Sonar implements multiples rules. Check your process, and if they are not correct, then Sonar can disable the process.