Hello There,
Thanks for writing in!
This is not a theme related issue. This has something to do with how browsers treat rss feed links itself. IE and Firefox has a default RSS feed reader. Once you click on a link, it will ask you whether to add in the feed reader or not. In Chrome there is none.
Now if you try to install an RSS feed reader extension in Chrome, like this one: https://chrome.google.com/webstore/detail/rss-subscription-extensio/nlbjncdgjeocebhnmkbbbdekmmmcbfjd/, upon clicking on the link, the rss feed reader extension take over and you will be ask to add it or not.
Let us know if this has been helpful to you.