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Hey!  Dave from the Help Team here, Most discrepancies in keyword rankings are caused by the way Moz is querying Google and other search engines. Our process completely strips personalization from the query. This means that it's more representative of a national average for all searchers in the country, but it also means that you may not be able to reproduce these exact SERPs within your browser because your location is factored into your search results. One of the SEO experts in our community offered a really great explanation of this difference here. If you are seeing some big discrepancies that don't seem to make sense to you, please shoot us an email at help@moz.com with some examples, we would be happy to take a look for you! thanks