POP Gmail account keeps downloading same mail and not showing current email - Outlook 365

I have connected a Gmail account to an Outlook 365 client.  It seems like each time I click send/receive, it keeps downloading about 412 messages each time.  I'm guessing its duplicating the messages.  At the same time none of the most current emails in the online Gmail account from today seem to appear in the outlook client.  Its a real weird problem, I've never experienced.  Any ideas what I should do?  This is a rather large mailbox that I'm dealing with.