This is a similar issue to this old report about the Gmail app
https://xenforo.com/community/threads/gmail-app-and-xenforo-emails.55403/
It happens in the Inbox app as well.
Unlike the issue with Gmail which was happening only in mobiles, with Inbox it happens in the desktop as well.
Inbox by Google is currently closed for invited users only, but once it opens publicly it will be widely used.
So I think it might need to be checked again to see if there's something to do about it.
https://xenforo.com/community/threads/gmail-app-and-xenforo-emails.55403/
It happens in the Inbox app as well.
Unlike the issue with Gmail which was happening only in mobiles, with Inbox it happens in the desktop as well.
Inbox by Google is currently closed for invited users only, but once it opens publicly it will be widely used.
So I think it might need to be checked again to see if there's something to do about it.