'Thanks' button seems to be broken.

I went to thank Gaz in a thread for an awesome link he included.. But found that he had no thanks button next to his name and only one post below him had the option to thank.

See here:

http://www.talkfreelance.com/showthread.php?t=73607


Happens here too: http://www.talkfreelance.com/showthread.php?t=73552

Oddly it's right when mafiaya posts O.O

http://www.talkfreelance.com/showthread.php?t=73707 (I can thank Dan only)
http://www.talkfreelance.com/showthr...t=72703&page=2 (I can only thank Dan and Taekwanjoe's post which is the 2nd to last one)

Works here though:
http://www.talkfreelance.com/showthread.php?t=73777 (I can thank 100% of the posts)
http://www.talkfreelance.com/showthread.php?t=73840 (I can thank 100% of the posts)