This is a pretty big bug that I haven’t seen before!
Yesterday I received mesages from Fiverr (Only to my mail, which I don’t check daily) notifying that I’m late delivering 5 orders, all from February 13 only.
These 5 orders haven’t appeared in my to-do list for some reason at any point, so they have gone completely unnoticed!
If you’re a seller, you might want to check your sales data if there’s any late orders there. Though for me, these didn’t show anywhere until being delivered. So keep an eye on your mail as well!