Also, you don't have a logged in curseforge page opened on some random other computer, do you? A bit far fetched, but it could be they're all being marked as read by being "seen" some place you are note? o.O
I also have not received a notification email since Friday, normally there's one every single day. Also, no updates in the Notifications box since Friday either.
Between the time I posted this and now (3 hours later) notifications for yesterday and today just appeared in the Notifications box. Hopefully tomorrow I will receive a notification email going back to Friday.