Line spacing issue

I recently switched my forum over to ckeditor. The issue is now when a user hits ENTER, a line break appears that makes it seem like there's an actual space between the lines, yet when the user submits the post/node, the lines are stacked on top of each other. This is incredibly annoying for them. As a decente web developer I can easily fix this for my posting, but they're just regular joes.

Is there a setting I need to tweak? 

Ok I just tested this actual post. When I hit enter it creates a line space that still shows up in the finished post. Interesting..