RSS Feed

Another site wants to display content from one of my sites. The Joomla RSS Feed function works fine, but the dreaded code showing ([data-gutter="2%"][data-nb="2"]) 
is displayed there. Can you think of anything I can do to prevent this and just have the basic content feed into the other site?
 

Hi
Please give me the steps to reproduce the rss feed as you, so that I can test
the problem is that the content must pass into the content plugin ...

CEd

Thanks Ced, both  rssgizmos.com/ and rss.app/ show the feed perfectly, so I will need to explore how the feed is being read. I will follow up here if I find a solution.