Highlighted Track Navigation

I setup a knob to scroll left & right through, & highlight my tracks. The functionality is working however it will only scroll right between track 2 & the reverb track. Once it reaches the reverb track, it stops scrolling (rather than going all the way to the master track) & then loops back around to track 2 again. I can only scroll it to track 1 by scrolling left from track 2. Its weird & annoying, I spent a while trying to troubleshoot different settings before asking here, any ideas? Thanks.