Hello there,
I have a very low retention rate (76% these days), which could be explained by my irregularity in the past few days, but then, even when I was very regular my retention rate was around 86-7%. How come? Could it be because some lists have the same characters (for example now I'm doing both hsk 1 and new Chinese practical reader), and that would mess up the kitten? But then logically my retention rate should be higher than 90%, cuz I'd see the characters more often than I'd need...