this likely has a different reason:
You entered HTML code (for the button) into a table cell. That code likely contains line breaks in it, which get transformed to HTML
<br/> tags by WP-Table Reloaded (a behavior that is intended for text, but not really nice for code, unfortunately).
So, what you will need to do is: Remove all line breaks from the HTML code in the cell. So, basically, your code should be in one line (except for those that get added by the browser due to the width of the textarea).
Also: Unfortunately, I could not very this, as your link does not work for me. Is that really a published post/page?