Please see the link below: (I hope it works)
https://checkvist.com/p/13Ki3mDRtEEu3svF7kvoyF
As you will see, the progress counter total is incorrect based on the single subtask. It thinks (in this instance) that 8 hours = 1 day.
I have many potential uses for the feature and would be grateful if you would look at fixing it.
Many thanks.