What makes you think you have an 8 channel trackspot? Can you explain further please? Do you mean your desk has an 8 channel library? What console are you using? More information will help us help you.
Maybe when setting the address dipswitch you are getting confused. With all addressing dipswitches OFF, the fixture should use 7 DMX channels starting at 001. When you do this does the fixture line up correctly with your library. If not, then the problem is with your controller or its fixture library.
I have this same exact problem. I use a Martin Freekie. ch 1 does nothing. ch 2 and 3 do pan and tilt. ch 4 does color. 5 does gobo. 6 and 7 do shutter and intensity. I've nicknamed channel 8 as "wakey-wakey" because unless I fiddle with it first, the trackspots don't even respond.
Download the manual. It only has 7 chans. With HES all addresses down is 1, most others 1 up is 1. Been that way since dirt. www.highend.com/pub/products/automated_luminaires/Trackspot/manual/tsv41.pdf