Wrong RSS feed

RSS feed of my blog Voice from the rooftop is changed from

http://go4quiz.com/vincent/feed/

to

http://go4quiz.com/vincent/comments/feed/

and my indirank is dropped from 82 to 61.

How to modify the feed?  I can't find any option to edit the feed link.

HTML is not working. While editing the topic I used the code

<a href="http://go4quiz.com/vincent/" target="_blank">Voice from the rooftop</a>

to open blog in a new window. It didn't open. When I checked the code it was changed to

<a taboo="_blank" href="http://go4quiz.com/vincent/">Voice from the rooftop</a>

Anyone else is facing this problem? Any solutions?