Shanai Marriage Honey stats broken

Hi, the Score Statistics graph for Shanai Marriage Honey seems broken. https://mydramalist.com/77393-shanai-marijjihani/statistics

It shows no rating over 6.5, which can't be right since the drama presently has a 7.9 overall rating and I know many people (including myself) who have rated the drama above 6.5.

not just for this one but all dramas/movies statistics are messed up ever since the rating system changed.