thats a multi-account issue, The user by the name of "lol" (not a registered user) got 15+ thumbs in many comments he made in the comment section. Those comments were a little out of line or just so nonsense to get that many positive votes. Also another username: interista, had a similar issue on the highlight were he commented and got 20+ and when he was replied anyone got -4 or -5 so... yes it is a multi-account issue which is as old as this website is.
to Footyroom, lately something is going on in Juventus highlights comments, someone is downvoating whoever writes something pro-Juventus to the point that those comments get hidden, so basically censored. you may want to look into it.
in the yesterday match 17 comments over 39 were censored:
<http://footyroom.com/genoa-0-1-juventus-2014-03/>