Board Thread:The Quarters - Q & A/@comment-49.147.162.17-20160405015559/@comment-24672610-20160405123741

Yes, sorry I didn't make that clearer! Your damage registers at the end of your day--by default this happens at midnight, but you can change it in settings. So my guess is that your first set of tasks was completed before midnight, your Habitica day ended and Habitica processed those and dealt out the damage, then you did more after midnight. Those seemed like the same day to you, but from Habitica's perspective, they happened the following day and you won't see the damage until the end of that day.

You can read more about the process at Cron.

If this is what happened to you and you expect you'll be completing tasks after midnight more in the future, you probably want to go into Settings and edit your Custom Day Start to a time safely after you would be done completing your tasks for the day (e.g. mine is 3am)