(SOLVED) How is area scaling calculated?

[Radiant]

So, if a walkable area's highest point is at Y=20, and its lowest point is at Y=100, and it has continuous scaling from 15 to 63; then I'd expect the scaling to be 63 at its lowest point.

Turns out this is not the case and it's actually 49. How is this possible?

I'm trying to connect this walkable area to the next one which has non-continuous scaling of 63. But there's a mismatch here.

[Gilbert]

Hmmm. Is it possible that there is a strayed pixel of the area somewhere below the supposed area?

[Monsieur OUXX]

either that or the character has some transparent pixels below its feet making you believe it has walked all the way down when it hasn't.

[Khris]

How was this solved?