Choosing who gets notified on form submissions

Question:
Has anyone noticed a bug in form submissions going to everyone on the site instead of just who they are set to go to?

Product:
Currently, we are using the Wix Editor for many sites and quite a few of them have this issue where when a form gets submitted (old form), it goes to each person who has access, not just the email it is set to go to.

What are you trying to achieve:
Ideally, we would like to just have our client get their own forms and not our agency.

What have you already tried:
I have reset the form submissions notifications countless times and republished the site. It looks like all settings are correct for just our client to be receiving the forms.

Additional information:
Oddly enough, this doesn’t seem to be happening on all our sites, just a few.