X Touch + Extender but fader bank is only 8 channels

Hi,

This white line is acting a bit strange… when I’m on the 1st channel, the white line goes from channel 1 to channel 16 (which it should be).
If I press fader bank up, the white line goes from channel 17 to channel 24 (8 channels only) but i’m controlling from channel 9 to 24 (again, 16 channels), If I keep pressing bank up, it only shows the last 8 channels i’m controlling, instead of the current 16 channels. What is strange is that if I press fader bank down, the white line starts showing the current 16 channels i’m controlling but with the bank size of 8, instead of 16!
I don’t know if I was clear! I made a small video showing this problem. In this video I’m always moving the 1st and the 16th fader. I think you will understand.

Thanks for all the help