we are encountering an issue where a significant amount of traffic from email tracking code (starting with e) is moved heavily out of email and into direct and also paid search tracking code (starting with s)is moved into referrers. Nothing significant has changed on the site and was wondering was if anyone can shed light on why this could be happening.
Tracking Codes and Marketing Channels have different persistences.
As you've stated, your Tracking Codes expire after 7 days.
But Marketing Channels are evaluated with every hit.
So, a user could have come to your website via a Paid Search tracking code, thus getting his Marketing Channel set to "Paid Search". But then he returned to your website (3 days later) via a link from his friend's website. Then, his Marketing Channel is set to "Referral", but AA still remembers his Paid Search tracking code since 7 days haven't passed since it was set.
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