To give more detail on how it happened, the princess was falling on the right side of the screen and I was in mid run when I caught her. I think I slid to the very right side of the screen then, while holding the princess, and then when I threw her back up, the bar was gone. I hope this is enough information to fix it, but at the same time it seems like one of those super rare errors that will probably never happen again.
Viewing post in Don't drop the princess ! jam comments
I'm glad you liked the game and thank you for reporting the bug, it seems indeed that this bug is not very frequent but a friend of mine already had it. I will try to invistigate to find what's the issue. However I don't think I have the right to update the game for bugfixing during jam time so I will have to leave it like that for now. Hope that annoying bug won't happend to you another time if you try again!
And good job for doing 10! I'm stuck at 20 for now!