Arrow keys not working in Safari

Hello suitsusir,

To help isolate the cause of this issue, create a new user account and test to see if the keyboard works properly in that new user account. This article shows you how:

Set up users, guests and groups on Mac - Apple Support

Add a user

On your Mac, choose Apple menu  > System Preferences, then click Users & Groups 

If the lock at the bottom left is locked , click it to unlock the preference pane.

2. Click the Add button  below the list of users

3. Click the New Account pop-up menu, then choose a type of user.

4. Enter a full name for the new user. An account name is generated automatically. To use a different account name, enter it now — you can’t change it later

5. Enter a password for the user, then enter it again to verify. Enter a password hint to help the user remember their password.

6. Click Create User.

Best Regards.

Hello suitsusir,

Since this hasn't been resolved with safe mode or the other steps we've discussed here you'll need to Contact Apple Support to go over more troubleshooting.

Use the link above to get in touch.

We hope this helps.

Cheers.

Hello suitsusir,

We understand that your keyboard isn't working properly on your one Mac, but looks to work with another. Are they both Silicon-based Macs or is one Intel? Also, have you confirmed there's no third-party firmware update for the keyboard?

Thanks!