Watch face keeps ignoring one event

I use the Modular Ultra watchface and it's perfect for my daily use. And the center complication I decided to use the calendar 'time line'. It's great because I'm always in and out of meetings and it helps me a lot to know what meeting is up next.

However, recently, Apple Watch has decided it'll pick that 'one event' of every single day to not display it. It simply ignores that event, which is on my Mac and iPhone's calendar, but for some reason it won't show.

Has anyone else come across something similar and if so, is there a fix for that?

Appreciate your comments! 😊