Question Grid Layout Group Changing Size Between Scenes and Builds...?

Edit and Tl;DR: It works between scenes, but not in builds. Basically, the spacing in my Grid Layout Groups increases when the game is built.

What's up with this? The spacing and size of the grid items changes when I build the project and play it on WebGL.

So this:


Will turn into this:

When it's in the build. Why does it look different?

These are my Grid Layout Group Settings:


This has been annoying me for a while, what's wrong with this component?
Also, it looks fine with every resolution in the Unity Editor, so I doubt resolution is the issue.
Thank you

EDIT: I pressed play and now it randomly looks like this...