Right now, the hours estimates shows total plan hours. We'd like that to update and calculate factoring in the percent complete. Hours are currently being overstated because they don't take into account what's already partially finished.
I'd suggest logging this as a bug. I seem to remember that the second wave of agile stuff they did about April 2016 ish was supposed to include counting this correctly. However, we certainly have seen a number of bugs in general in "agile math."