Hello,
I was struggling with this too. However, i found the solution for my problem and created a post for it on my blog – check it here: http://mr-wordpress.com/fix-for-the-the_content_limit-function-limit-posts-plugin-when-previewing-a-single-post/
Let me tell you why, as it was the same case with me.
When you are testing it from various browsers, you are most probably logged in from just one.
Let’s say, i was logged in with FF
I was testing some things and clicked on links using IE and Chrome and woala, more page visits.
It could be that…