Short in zone 1-8 terminal block

I have 16 zone Gen 2 controller and I currently only have have 7 zones in my system but plan to add 3 more shortly. When i try to connect my system to the 1-8 zone terminal block it seems that 1 zone turns on as soon insert the common wire although i’m not testing any zones and not running any schedules.
When I use the 9-16 zone terminal block everything works flawlessly. Currently that’s how I have it connected but in when I add the 3 zones in a month from now this controller will not work for me.
Has anyone else had this issue?

That seems odd.

Check output on zone one terminal with no wires and a volt meter?

What happens when you plug another zone wire into the zone one terminal?