My emails are now going into Unread Folder rather than Incoming Folder and I
don't know why the change or how to fix the problem.
No it's not. It's appearing in BOTH folders. The Unread Messages folder is a
search folder, not a real folder. You'll see an "In Folder" column in Unread
Messages which will tell you the real folder where you can find the message,
and I'd bet my next paycheck it says "Inbox" for the new messages. If you
can't see the new messages in Inbox, then you have a view of Inbox that's
hiding them or you've sorted Inbox on a hreader other than Received. Reset
your Inbox view to its default and they should appear.