I have noticed that recently with GMail a lot lately, even when originating on their own gmail.com addresses.
Google must have changed something with their filters causing these false negatives.
Thanks for pointing this out.
Actually, Gmail is technically correct. Forum emails are not sent by us. The forum is hosted by https://www.communiteq.com/ - so they sent these emails on our behalf.
But of course the emails are safe, they are from this forum.