Transactions Pending, not processed

I had another request in that seems to have been dropped after several days, so opening a new request. I had already granted site access as requested and then extended it with no access yet.

Here's the issue:
I have three transactions in the pending category. They are assigned full membership privileges, but paypal doesn't have record of them. Here is the error message (with name removed). They have a user account that was created.

Last transaction is pending. Reason: Customer did not register or confirm his/her email yet

I have other transactions that have worked so not sure why these are having problem? Thanks for your help!