Problem with Patreon & Zapier - Mail delivery for new patreons

Hey there
I have a problem with patreon & zapier, and I don’t know which end is causing the problem.
Everytime a new patreon arrives they ALWAYS get TWO emails. One with the number of Patreons before they joined and one with the actual number.
For example:
I have 160 Patreons and “Michael” gets a new patreon. He will receive the welcome mail with “Thanks… with you, we reached 160 Patrons” and another Mail with “Thanks… with you, we reached 161 Patrons”
The mails are send both at the same time. You see three examples of the last few days in my mail-picture.

Why is that?

Best wishes
Sören