Why do I sometimes getpush notifications about new emails on my custom forum?

Question:
[ Why do some of the Wix forums show up in my notifications box and others don’t? although I have my notifications enabled on my phone, and email, I am inconsistently recieving emails about some of my sites. Also how can I make sure that my other collaborators are receving inbox notifications and not getting them sent to junk? ]

Product:
[Wix Editor/Wix Studio.]

What are you trying to achieve:
[I am trying to enable reliable and consistent push notifications for myself and my team. I maintain 3-4 sites for the same company, and I consistently get email notifications about one, but am not notified about the other oneI would like to get consistent email notifications and ensure that these important email responses are not being pushed to my junk mail or unseen.}

What have you already tried:
[I have followed the wix-how-to enable notifications button blog and read several other blog posts from wix about other what I am doing wrong.]

Additional information:
[It is a custom form so I wonder if that could be an issue. ]