Keyboard skipping to the next line

Hey there,

Are there any scratches or cracks in your screen?

Or is there any dust, liquid or screen protector on your screen? If there is dust or liquid, clean your iPhone ☞ Cleaning your iPhone - Apple Support

If there is a screen protector, remove it to see if it is causing this problem.

Plus Are you using the default Apple keyboard, or a third-party one?

Let’s try this steps:

1.Restart your iPhone 

2.make sure your iPhone is up to date Update your iPhone

3.Disconnect any Lightning or USB-C accessories. If that problem doesn't happen after removing an accessory, try using a different outlet, cable, or charger.

If you are still facing this problem after trying these steps, you might need to set up service for your device, Contact Apple Support.

However, I can give you a temporary solution to this problem, which is to turn on the Ignore Repeat feature:

You can choose to have multiple inadvertent or involuntary taps read as a single tap. Just tap a duration while you're using several taps. To enable this feature:

1. Go to Settings, then select Accessibility. 
2. Select Touch, then select Touch Accommodations.
3. Turn on Ignore Repeat.

What apps does this happen in? All or just one?

You’re welcome ㋡