[Axes] LeftStickX=Axis0+ LeftStickY=Axis1- RightStickX=Axis2+ RightStickY=Axis3-
Some newer versions may store user-specific configuration data in %USERPROFILE%\Documents\FIFA [Year]\settings\ . Structure of buttonDataSetup.ini fifa+button+data+setup+ini
If you use FIFER, EEP, or any major mod, the is often overwritten. In that case, look inside: or any major mod
You likely missed a = sign or added a space. Open with Notepad++, check for red syntax highlighting. Restore your backup. fifa+button+data+setup+ini