Slider shortcode apending extra code

Hi,

When i add a gallery slider it adds extra code, for example.

[su_slider source=”media: 1251,1250,1249,1248″ link=”lightbox” width=”800″ height=”400″ title=”no” pages=”no” mousewheel=”no” speed=”400″][su_slider source=”media: 1168,1166,1169,1172″ link=”lightbox” width=”800″ height=”400″ title=”no” pages=”no” mousewheel=”no” speed=”400″][su_slider source=”media: 1146,1147,1148″ link=”lightbox” width=”800″ height=”400″ pages=”no” title=”no” mousewheel=”no” speed=”400″][su_slider source=”media: 1130,1129,1128″ width=”800″ height=”500″ title=”no” mousewheel=”no”][/su_slider][/su_slider]

I have turned off all other plug-ins and changed theme to twenty 14.

Any help as to what is causing this would be great!

https://www.ads-software.com/plugins/shortcodes-ultimate/