users and subscribers

I have two issues, likely related.
First, when I look at the list of subscribers, there are no names. I can export the list and get names. I would like to see them without exporting. If I add a subscriber from the blog, it goes into the subscriber void. For example I added myself and I did get the latest post. I think there is a discrepancy between the export list and who is getting it, but am not sure since I can’t see everything.
Second, I am getting a steady stream of email messages saying I have a new user registration. I received over 40 in the last few days, all (but one) with a yahoo email address. The front part of the email addresses look like they are phony. When I look a the list of users they are all set as subscribers. I changed my (strong) password and that did not stop it. I don’t know how they are adding users.