Pro sites, changing plan: email sent to network admin instead of subsite admin

Hi,

I've got weird behaviors with Pro Sites.

For now, I have only Pro Sites with Stripe gateway installed on my multisite.

A user subscribes to free plan and receives an email with login/pass informations -> ok

This user subscribes to a monthly subscription and receives an email with Payment informations -> ok

This user subscribes to a quaterly subscription for the same plan and receives an email with Payment informations -> ok

Same user change his quaterly subscription for another plan and an email with Payment informations is sent to the network admin instead of the customer. ??!

How could we fix that?

If needed, Support access is active.

Best regards,
Frank