RSS Feed Validates But Something Wrong

The feeds to my Wordpress sites (3 of them) validate ok, and I can't see any obvious problems with them, however when I use them with sites like Squidoo, no content displays.

Other Wordpress feeds seem to be ok, but there is something with mine that is not liked. I wondered if someone might be able to spot what the problem could be.

One feed is delovesto dot com /feed/

The only thing I can think of is that it might be due to the Super Cache plugin in Wordpress, but then it would affect a lot of other sites too.

I have it burned in Feedburner too and that seems to be ok

Thanks for any help and recommendations.