vb.org Archive - View Single Post - "similar threads" box is only displayed in some topics

my forum have 62,000 posts, there should be similar threads...

here's another example :
http://www.pirate-punk.net/message.php?t=3962

the title of the topic is "Ren? Binam? - Vocations"

there is no similar threads for this topic, but there is multiple other topics named "Ren? Binam?"

like this topic

http://www.pirate-punk.net/message.php?t=3988
called "Ren? Binam? - 71-86-21-36 - R?volution"

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