Space is too big - Can't adjust it

I have exported my font and when I use it, the space is too large. I’ve gone back into Glyphs and resized it, but that doesn’t seem to make a difference. The kerning is at 0. (I tired to do negative kerning, but that didn’t work). Any way to change how wide the space is? Thanks!

This is probably a font cache problem. Read this please: