[macue]

Hello, I just signed up and I am going through the Crodelia excercise in which I am supposed to switch between F and A-minor chords. The intro video shows A-minor using the middle finger. However, the excercise shows the use of the index finger instead. Other sources on the internet show A-minor using the middle finger. And this makes more sense since Iam supposed to switch from F to A-minor and back again quickly.
Is this a bug in the software?

Iam using the iPad version.

Thanks in advance
Mario