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Properly configured Mint should not track the local domain as an external referrer. Your screenshot is too closely cropped to illustrate your question.
Where is Mint installed? On a subdomain? What domain is it tracking? (use abbreviations if you don’t want to publicly name the site, eg. wc.com or dat.be?) If the server is misreporting the installation location to Mint it may get confused about what is a local referrer and what is external.