Confusion about chicken leg & thighs nutrition facts (calories)
The numbers in the USDA are empirically derived. They take several pieces of raw chicken (or rather, find others who have done that) and measure the calories. Then they publish the average number of calories between these pieces. Separately, they find measurements for cooked chicken, and publish that average. 

Empirical measurements are never exact. The chicken pieces vary in calorie content, the measurement procedure varies, the calibration of the instrument varies, etc. So, you can expect quite a bit of spread. And it seems that this is what you are seeing here. The measurements of raw and of cooked chicken don't match up - this can happen. You usually cannot say which factor was responsible. 

This also is a good reminder that it doesn't make sense to calculate calories to the gram, since the piece of chicken you hold rarely has as many calories as given on the label or in a database. The exceptions tend to be highly processed foods which have little variation.