Font doesn't seem to be using the .fnt file

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I'm using: Roobert-24-Medium-table-36-36.png Roobert-24-Medium.fnt files from the Resources/Fonts folder of the SDK but no matter how I change the .fnt file it doesn't seem to affect the font on screen. Do I also need to load the .fnt file somehow (as well as the .png)?

I was trying to adjust the spacing of "11" like it shows in the docs but it doesn't seem to be working.

Thanks