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When emails are received and loaded, the font links used in the email can be tracked as clicks in email reports. To avoid this, you can use an @import reference instead of a to load your fonts.

If you use to import a font for a Pardot email, you may notice that the font gets tracked as a click. This happens because Pardot tracks links that begin with http:// or https://, so links such as http://fonts.google... get rewritten and tracked. Pardot records clicks when these links are loaded as part of the CSS reference.

Community Answer: https://success.salesforce.com/answers?id=9063A000000e7iqQAA