When creating a character, I have noticed that there are dates in each month (Moon) that are duplicated. For example, in the Sixth Astral Moon, the 10th reads 11/10, but the 11th also reads 11/10. The 12th then shows 11/12, and onward it seems to work. Each month has a similar issue with one of the dates.
I'm assuming this is a bug of sorts, because it's just inconsistent.