In my site network, users are seeing other blogs in their mysites drop down. Please help.

Hello,

My users are assigned one blog each. They should be able to access their blog and my main blog. They are seeing other blogs in their "My Sites" drop down in the admin bar. Why?

I have gone through and deleted each user from each blog that they shouldn't have access to. After this, I browsed my network to confirm that each user could only access their own site. It was fine.

I've logged in today to find the same problem. Please give me some ideas of what I can do to fix this.

Best regards,
Sonny