Hi Bushamy , would you be able to tell me what plugin you used
I cant explain why it changed when you migrated your hosting package , but I was having issues with the feed displaying in chrome and firefox . I am new to wordpress but it appears the issue is that wordpress have not added the script to correct this issue and chrome and firefox do not support rss feeds .
While some people have chosen to steer round the issue by forwarding their rss feed to feedburner , I found a plugin which fixed the rss feed issue for me . http://ww.wp.xz.cn/support/view/plugin-reviews/feeeeed . Although I must say it didnt fix the issue with the “comments” rss feed .
I have submitted a review to the developer and I am hoping that they will add a update to the plugin to fix this issue .