Meteor slideshow shows twice

I would like to ad a different slideshow to different posts or pages. So I bumped into Meteor.
I tried it now on one post.
But when I enter the shortcode it ends up showing one slideshow in the top-left corner, above the header and one on the place i entered the code.

I just entered the shortcode in the post, nothing in the template, is that the problem. I’m not familiar with php so I don’t know where to put it if I need to alter the php.

I really would like some help with this or a good alternative.

Thnx,
Saskia