Take this post as an example:
/products/pcbprototyping/f/forum/54568/need-help-making-a-fast-transition-to-kicad-from-eagle
Earlier today, every comment posted had 1 or more upvotes. Now they all have zero. If I look across other posts there's a lot of '0' upvotes in comments which I struggle to believe is accurate. It would appear that some small minority of posts still do have some upvotes showing though so no idea what is going on.