Someting wrong with Membership

On site 1 we have 1159 members in the group CTO.

On site 2 we have 45 members in the group CTO

But on site 2 the count is strange, see image (

On site 2 we also have the eNewsletter plugin. I cant find one of the admins in the list. If I try to add him the system says he already exist. When I can't see his name I can't add him to the right group...

What more info do you need to help me? (wpmu 3.81 and latest version of Membership and eNewsletter)