Rpg Maker Developers Group

This one shouldn't take long. I'm looking more for an explanation as opposed to a solution.
 
So, I do some parallaxing. I was introduced to this skill back in VX which made use of OriginalWij's "fixed" parallax script. So, naturally, moving into ace I just import this RGSS2 script into the new RGSS3 system. Why? Because it works! ...sort of.

Here's a quick demo.

Basically, everything works fine with the bare-bones 17*13 maps; the map is static and all the overlays are functioning. However, once I get to larger maps it's as if the parallax is treated in an entirely different way. Now, just to clarify, I am not looking for script support. Seeing as this script is obviously obsolete at this stage, the appropriate updates shouldn't be hard for me to find.

I'm just curious if there are any fundamental, in-engine differences between parallaxing in VX and ACE.

Thanks for your time!