comment shown seperately

Hey guys,

my problem is that after i comment on a post on my elgg site, the comment will not only be shown under the post but it will also create a seperate post which i guess has to do with activity or something like that, but i really don't want that because it's quite lame.

Here's a picture about my problem, it may clarify my confusing explanation :)


Please help me if you can. Thanks in advance. :)