Glamdoc UI Broken
Go into the keybinds settings and rebind the UI keys to whatever they currently are, even if they are already bound. Alternatively, try holding the "F" key instead of the spacebar to apply your changes.
Go into the keybinds settings and rebind the UI keys to whatever they currently are, even if they are already bound. Alternatively, try holding the "F" key instead of the spacebar to apply your changes.
Suggested fix (unconfirmed): Disable or remove the Better UI inventory mod. If that does not work, verify your game files multiple times until no corrupted files remain and restart your PC.