Light exercise & eating back calories

My burns aren't that great either, and at the low level, I'm not sure how reliable the calculation is. I have a heart rate monitor, but I can't get a reading off of it.

Sooooo... I very rarely eat any of my calories back. What I do tend to do... oh, this will be an awkward explanation... most days, I usually eat about 100 or more calories shy of my goal to leave a margin of error for food labeling and me being a fallible human being and possibly missing something or measuring wrong. On the days I exercise, I tend to eat to my actual goal.