In my sprint planning, I have a user story with four child tasks:

A - 4 hours
B - 1 day
C - 2 days
D - 2 days

This totals 44 hours. If I open the story it says that the Progress is 0/84 hours! Where did the other 40 hours come from? Also, this story and tasks are currently planned for sprint 2 and RTC says my work load is overbooked by 36 hours. If I move just the story, not the four child tasks to sprint 3, now I'm underbooked by four hours -- the difference is the strange extra 40 hours. Can anyone explain this behavior?

Thanks!

Chris