Broken UI?

In the statistics screen, the hours appear to be listed backwards, at least for me. The bars go from bottom to top (i.e. lower lengths of time sleeping have shorter bars), but the values go from top to bottom. So I still have a listed range of sleep periods (between 4 and 10 hours this week) and I can see which nights I slept the least and the most, but then that low value is listed at the top and the high value is listed at the bottom...

Basically, its a chart where the y-value is the opposite of what its trying to represent. I hope this is just a bug, and I really hope the developers fix it.

Aside from that, I feel this app works pretty well, although I dont think that it does a good enough job of explaining how the sleep efficiency works. It gives me a percent, but I dont know what that percentage actually represents. Is that the time during the night that I spend actually asleep? I would assume that, but the numbers dont correspond to the green/orange/red bars—I get numbers like 85%, but only about 60% of the bar is green. Maybe an info bubble somewhere in the app to explain how to interpret the information thats there?

Allhailrat about Sleep Better - Sleep Tracker, v2.0