Registration Spam with No Regstration Link

I’m running WordPress 4.1 running Twenty Fourteen theme

I took the Meta widget out of the Primary Sidebar, and I thought the Registration link was part of that, but when I just put it back in to check that. it wasn’t there. I took it out because I’m using Mail Chimp.

Here’s the problem. Mail Chimp only shows my own two registrations and no more. Yet I’m getting these daily email messages in my yahoo email with the subject like this:
[Vision Democracy] New User Registration(65)

and as an example of one of them:
New user registration on your site Vision Democracy:
Username: oxbeiyhf
E-mail: _____________________ (I’m leaving the email out)

How is this spambot registering users????

~Bruce