World events missing

So, I've been using this overlay for 2 days now, and I must say I really like it. One problem I've noticed though, is that using the world events menu, I've been seeing a 15 minute slot where there's no boss listed. This has happened to me 2 days in a row with the Shatterer, at 10AM GMT. My menu is also missing Frozen maw at 12:15 at the moment. I've used both standard and adjusted mode, but the issue still persists. I've also made sure that the missing events aren't hidden, and they aren't. They'll be missing from 1 slot, but showing up if I scroll further down, for a later time.