Cannot search for contacts – Mailchimp Email Marketing Review

This app is great and I am sure I'm not using it to its fullest potential yet, however, one thing I need it for is to search for my contacts...which the app is not letting me do. It sometimes brings them up by name and a lot of times says the name doesn't exist. I go online on my computer to MailChimp.com to search for them and wahlah there they are. Why is this? Is there any way this can be fixed?
Review by SuperNovaSarah on Mailchimp Email Marketing.