Well ASP-1, due to the giant silencer, has a heavy bullet exiting at a slow muzzle velocity --> massive bullet drop on range.
Arma 3 Scopes are zeroed on 300 or 200m, some scopes are even zeroed on 500m (such as lvl2 scopes), on that distance the bullet drop is already massive, that's the reason why you shoot to high on closer ranges.

Best Tipp: don't take a Sniper scope on a shotgun....

Yeah I understand why it shoots high.

None of the other scopes arc the shot at all. Only these ARCO, ERCO, RCO. I guess my question is if it is intentional that only those 3 scopes have a different zero.

Zeroing of all Scopes:
200m:

• ARCO
• DMS
• ERCO
• MK17
• RCO

300m:

• ACO
• MOS
• MRCO

500m:

• AMS
• Kahlia
• LRPS

https://forums.bistudio.com/forums/topic/197190-feedback-thread/?do=findComment&comment=3112779

5. Zeroing was set to 100m.  It's for the sake of making the game more user friendly. Since the scenarios are taking place on rather small areas the zeroing should be sufficient. Manual zeroing felt like too much of a complex mechanic.

I thought they were heading this direction with Argo.

You were right, most weapons zeroing was changed, also the ASP-1 with level 2 scopes is zeroed in 200m, unlike most other weapons