I got a letter saying that I qualify for the EITC but when I went to amend on here is has a different max to qualify than the IRS has so how do I fix this?

The max you can make to  qualify on the IRS is  $21,430 if  you  are single and  with 0  kids but on turbo tax the amount is around $15,000. I was told by the IRS that I do  qualify but since they are so backed up  I would have a  better chance getting it by filing  an 
amendment electronically with the provider I used to file originally. I'm not sure what to do  since Turbotax is wrong and won't  allow me  to qualify based on incorrect numbers.