> +*.html?sid=*
> +*board.php?boardid=*

> but HTTrack ist fetching everything e.g.
> ...addreply.php?postid=2182933&sid=

I assume your filters start with -*
The first requires a url with .html and your addreply doesn't match
The second requires board.php and your addreply doesn't match that either.
You got only what you asked for.

Next time post the actual command line used (log file line two)