bbPress.org

Hello
I have successfully migrated my forum from PHPBB to bbpress, but i have encountered a problem that i do not know how to result this

Example
If you visit this topic http://www.bushcraft-pt.org/?topic=leather-work-by-jpgrilo and try to click on button of the page 16 it will return an error “This is somewhat embarrassing, isn’t it?
It seems we can’t find what you’re looking for. Perhaps searching can help.”
I have found that the software is malforming the url. Instead of this http://www.bushcraft-pt.org/?topic=leather-work-by-jpgrilo&paged=16 he is generating this
http://www.bushcraft-pt.org/?topic=leather-work-by-jpgrilo6.
The strange thing is, if i click in the button referring the page 2 everything works fine.
How can i result this problem, any ideas?

WordPress 3.8.1 running Twenty Twelve theme.
bbpress Version 2.5.3

Thank you in advance
Joao