User automatically added to project assignation when status change

Hi,
We have several project created by user A. When user B with acces in modification to the project assignations change the status of the projet, the user A is automatically added to the assignation list as a project member... Is this normal behavior or is there a config somewhere to fix that? User A in this situation do not have to be part of the project. 
History in the project show the added assignation before the status change, at exactly the same time.
Thanks!

Hi,
Thanks for the feedback. Every option is already set to No. It doesn't seem to be the cause of the problem. Do you have other ideas?

Thanks you!
 

HI,
User A has a custom profile exactly equivalent to Administrator. User B has a Team Member profile by default, but when assigned to a project, the profile is Project Leader in the project. I have adjusted some permissions in each profile, but its only to restrict or allow operations. I see nothing related to this problem.
Side note : Projeqtor version use is 10.3.3 but we had a similar problem with version 10.2.3.