edit: I dont know why I just clicked to this, but is it because of the glowing spikes on the Roach...ie is this a different model? I removed the requirement to research burrow move for Roaches.
I think it is a different model maybe.
Also burrow is a morph ability, you need to morph back to the edited Roach, otherwise it will morph back to default Roach, but unsure if it stay with the previous size.
No, that shouldn't be the problem, because if you change the model of an unit, no matter how that unit comes to the map, it will use the model size, maybe referring to old Roach or something like that. I attached a map to you see and compare with yours.
You can also morph the Roach to Ravager to test and the scale of Ravager didn't change at all.
Is up to you, if you want, you can pm me with the map or post free on here.
I think it is a different model maybe.
Also burrow is a morph ability, you need to morph back to the edited Roach, otherwise it will morph back to default Roach, but unsure if it stay with the previous size.
No, that shouldn't be the problem, because if you change the model of an unit, no matter how that unit comes to the map, it will use the model size, maybe referring to old Roach or something like that. I attached a map to you see and compare with yours.
You can also morph the Roach to Ravager to test and the scale of Ravager didn't change at all.
You're doing something different or editing the wrong model, look at this:
Base and with scale 2 (Artanis to comparison)
Follow the order and you're done.