space bar
my computer's space bar sometimes types 2 spaces when I only press once does anyone know how to fix this?
MacBook Air 13", macOS 10.14
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Try cleaning your keyboard with compressed air using this Apple article and making sure to keep the can upright or you could damage the laptop.
https://support.apple.com/en-us/HT205662
If an external keyboard works properly, then it confirms the internal keyboard is defective and needs to be replaced. Take the laptop to an Apple Store or an Apple Authorized Service Provider.