Subscription system and not changing groups for modérators

Hello !

I use the subscription system to allow my board's members giving me money for paying my board's hosting.

If a member pays for a package, then he is placed in a special group. The problem is for moderators : if they choose to pay, they change group and no longer belong to the moderators group...

So I have to edit their account and place them in the moderator group again.

Is there a way for moderators to remain moderators when the pay for a package ?

Thank you ! :)