EIC disappears after entering small stock loss of 2,000??

My taxes were 99% complete.. I finally got my investment summary which showed 2 stock transactions resulting in an 2100 LOSS. Before I added the stock sale, taxes showed approx 2600 refund. Adding the stock transactions, it changed to approx 560 refund. I could understand if the stock investments were huge but they were very small (1800 gross sale vs cost of 3900/ loss of 2100) It appears that the EIC was disqualified for the stock sale????