Rather than trying to correct information on the lines in a form, go back to TurboTax Deductions and Credits and review the information that you have entered through the TurboTax interview.
Here are the Directions for Form 8862
If going through the above steps does not find the error, then delete the entry that is there and enter it again.
Go to Tax Tools in the left hand panel
Tools
Delete a Form
Delete both forms - Earned Income Credit Worksheet and Earned Income Worksheet
Then go through the screens again to add earned income.
