UP exercise & negative adjustments questions

The more I look for the answers, the more confused I get. :(

I have been using the UP for a month now, and logging my workouts on the UP and my food on MFP. I don't think I am logging my work outs correctly. I do Jillian Michaels Body Revolution, so I log that as cross training on UP. I don't want to eat too much or too little.

Since I do Jillian Michaels, the calories I burned should NOT be logged manually on MFP, but should be logged on the UP app, which will then sync to MFP eventually right? Do I log my calorie burn manually or let UP do it for me?

I wanted to see how accurate the calorie burn I earned was with the UP, so I wore my Polar HRM with it. It was within 10 calories. I burned 337 calories today, and my diary is only saying that I earned 237 calories from exercise today. Where did my 100 calories go?

Also, should I have my negative adjustments activated?