Hmmm... is it possible that there was a tap-hold on Errands, and "Focus" was selected from the contextual pop-over that appears? If so, switching away and then switching back should resolve that...
Only other thing I can think of is that the perspective accidentally got edited on the Mac, and the "Focus on: errands" setting got synced over that way.
If neither of those explain what you're seeing, can you send us an
email? Taking a look at your databases on both devices may help us figure out what's going on here...
I'm really sorry for the trouble this is causing!