RSS Feeds showing as invalid due to & in URL and also refusing to pull

Hi,
I am unable to pull rss feeeds from an easyblog site into a WP site anymore.
This was working fine until a couple of weeks ago and now the feeds come up as invalid and refuse to pull.
Could you please help?

http://validator.w3.org/feed/check.cgi?url=https%3A%2F%2Fwww.cloisters.com%2Fblogs%3Fformat%3Dfeed%26amp%3Btype%3Drss

Thanks
Rowan