Outlook Express, has this ever happened to you?

[AU98TA]

I currently have three seperate hotmail accounts that I send and receive e-mail through Outlook Express. Recently I've noticed that some times my last account that gets polled for e-mails ends up being the exact same e-mails as my 1st account. It syncronizes the last account to what is in the 1st account. It will revert back to the original account is I close down OE and re-open it and check for new e-mails. Any ideas to why its been doing this? Has this ever happened to you before.