font face=Noto Sans
I also tried it without the formatting tags that you can see in the snapshot but it was no different.
What version of OpenLP are you using? Also, can you try without the <> brackets, they might be breaking it.
It's a bug in the 2.9.2 beta version. It's already fixed in development code, probably next beta will be released with the fix.
A temporary fix is to disable Alert Scrolling in Options -> Alert.