Hello I have this kind of situation, I really think this should not be happening...?!
how to leave only ONE "block" of choices?
OSX Version: 10.6.6 (had this bug earlier also)
Rebuild your LaunchServices database by entering the following command in the Terminal:
/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user
and then do a restart.
!
in Markdown, links don't.