The same thing has happened to me.
I decided to revisit this site after about 4 months or so to see how much they have fixed regarding the 'stacks' and bugs. What do I find? Stacks are barely function for me (but that is irrelevant to this topic), and my ratings and reviews are completely gone from my profile. Thankfully, I can still find the reviews on the games' pages but the ratings are nowhere to be seen. I'm ignorant concerning what has been going on on the website for the past months but seriously what have they been doing? Concerning reviews, ratings and game lists, its all become such a mess.