This is most easily explained by referring to the two (I hope self-explanatory) attached screenshots: one of the CS2 and one of the iPad.

IPad:



CS2:


(This is using the 7686 decoder and latest update for CS2 although I don't think that that is probably relevant.)

The "buttons" on the iPad and CS2 correspond in location - that is pressing "Track 3" on the iPad does the same as pressing "Track 1" on the CS2 - but, as can be seen, the icons are wrong. In fact, the looking at the addresses for each pair of functions, it is clear that the iPad Main Station app is off by one:

Address CS2 iPad
225 end/input clear/turn
226 clear/turn step/step
227 step/step clock/anti-cl
228 clock/anti-cl Track 1/2
229 Track 1/2 Track 3/4
...
232 Track 7/8 Track 9/10
233 Track 9 Track 11

Has anyone else seen this? If it is really a bug in the iPad app, how does one report it to Marklin?

Thanks!