Mapped Sub Domain Redirects to main site

My networkwebsite.com has a blog jelly.networkwebsite.com

I followed instructions and mapped the sub site jelly.networkwebsite.com to myjellybeans.com

But MyJellybeans.com redirects to networkwebsite.com, not even the old jelly.networkwebsite.com

I've got DNS down to and artform, that's not the problem. I've set up many WPMU networks, but this is my first one with buddypress and WPMUDEV domain mapping plugin.

Where should I start looking?