Issues with Composer

Hello,

I have updated a old blog post and I observed that it only allow me to save two tags, even I am doing five tags.

I have also done a button which shall open a white paper in a new window., It open fine but not in a new window as I selected it to do.

This is the URL to the composer; Link to composer at the blog post in the back-end

I hope you can help me out.

Thank you,
...Finn