It may be a mistake but it's not an issue for you.  

• Your local wages box on your W2 should include all wages earned for that employer and all local tax withheld.  
• You do not need a correction from your employer.  
• The amount earned should be the same as your state wage.

Note:  Confirm your local withholding with your year end pay stub if necessary.  If you don't agree with the amounts based on this, then discuss with your employer for clarification.

• In the search box type W2 
• Jump to W2  
• Edit or Add your W2