Accident in Common App for UChicago ED 1- how bad will it affect my chances?

I have pretty good EC's and GPA but on the institution portion of my Common App, instead of listing the starting year as 2015, I accidentally labeled it as 2013, making it look like I've been at that high school for 6 years. Will this completely skew my chances of getting in? My transcript has a normal schedule on it. Having lots of ED anxiety- thank you to any who respond.