Does a curve atlas provide me incorrect float values?

I’m trying to use a custom curve in a material to get certain values based on the Absolute World Position of the material.
I’ve created a Curve Atlas and a curve that goes up to 15,000 on X and 24,000 on Y, but when I try to retrieve a float value based on one of the Absolute World Position channels, the values I get seems to always be the same. It looks like it does not return values over 1, even though I greatly increased the Curve Atlas settings.

Can a Curve Atlas return values more than 1? Or is there any other way to use a curve in a material?