Button Duplicates when embedded

I have tried this a couple of times to no avail…

I go through the options to create my button and the preview displays the button how I’d like to be displayed on my site and when hovered over. However, when saving the button and copying the shortcode over to the section I’d like to embed it into, the buttons displays two buttons instead of one and I do not understand why.

Please can you help

Link: http://3f9.6dd.myftpupload.com/ (Testimonials Section)

Thanks!

https://ww.wp.xz.cn/plugins/maxbuttons/