Emails 'dumping' into Outlook TWICE sporadically.

A couple months ago I started getting emails TWICE. I would get the email as normal then a while later a whole bunch of emails would come in that had already come into Outlook. Anyone else have this problem? I have ruled out an Outlook or computer issue (or I should say my computer guy has) and I think it is the Homestead system. Let me know if you have had this happen and what to do please.