KDE Plasma 5 Notifications - missing characters??

Sometimes I'll see this very strange behavior when notifications pop up.  Some characters are simply not displayed.  Here's an example:

It should say:

System Notification Helper
A system restart is needed to complete the update process

Is that bizarre or what?  Here are the mising letters:

e
s e e s e e e e e s s

So, it looks like 'e' is missing a lot.  I never noticed that it was only ees and esses.  But, not all ees and esses - just some of them.

I've noticed them in other notification types as well, not just system restarts.