Keyboard types two different characters at once

Try using an external keyboard. Does the external keyboard have the same issue? If so, then you likely have a configuration issue or an issue with some third party software.

If an external keyboard works normally, then you most likely have a hardware issue with the built-in keyboard which will need to be repaired.

srvsinha Said:

"Keyboard types two different characters at once: Device: mid-2015 MacBook pro Certain keys on the keyboard are combined, i.e., when I press 'o', the output is 'oy' and when I press 'y', the output is again 'oy'. I turned on the keyboard viewer, and I see that when I press one key, either 'o' or 'y', both the keys are pressed together in the keyboard viewer.[...]"

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Troubleshooting Two Keyboard Characters:

Reset the SMC and your NVRAM:

(Applies to Intel-Based Macs Only): Sometimes when changes are made to the system(i.e. Updates), system configurations (i.e. for keyboard) become manipulated, technically. So, reset the SMC and NVRAM. Try performing each thrice. It may take sometime, being certain you have the time to perform these resets. Using an external to perform this, being your internal one is giving you the issue.

I have te same issue with a Macbook Air M2.

• pressing 'c' gives 'c,'
• pressing the less volume button gives less volume + arrow left key