You're using an old version, update and it should count all types of ammunition. I'm pretty sure it never misses any potions though, unless you're looting one at the same time as you're using another.
However, I have noticed that my cavebot scripts are overwriting the HUD with whatever version they're bundled with so I'll be making an effort to reupload all cavebot scripts bundled with the newest version of the HUD - and make it so they won't automatically overwrite existing versions with bundled versions.