GPSMAP 66i Page sequence bug?

So I bought a GPSMAP 66i and apart from trying to get used to the whole course/route activity/track thing which I'm finding very confusing coming from an old Oregon 550t, I think I've discovered a bug in the page sequence logic.

I start with this basic page sequence (I've deleted the Main Menu and the InReach stuff) and I have the Page Ribbon Display turned off as as I find the delay annoying.

Map
Compass
Trip Computer
Altimeter

This works perfectly as expected.

Now, if I add  "Active Route" to the end of the list (after "Altimeter") the resulting page sequence is ...

Map
Compass
Trip Computer
Altimeter
Active Route
Altimeter (Duplicate!!)

If I move "Active Route" to after "Compass", the resulting page sequence is ...

Map
Compass
Active Route
Compass (Duplicate!!!)
Trip Computer
Altimeter

Exactly the same thing happens if I replace "Active Route" with "Recording Controls", i.e. whatever is before it in the page sequence gets duplicated after it. And if I add both "Active Route" and "Recording Controls" I get two duplicates.

Note that if I enable the ribbon, it all works perfectly.

Anyone else experiencing this? FW is the latest version, 9.80 BTW.