Hello @yiyin18 You can have a look at below checklist in order to remove Audience Manager completelyRemoving DIL codeRemoving Server-Side Forwarding in Adobe Analytics LibraryUnpublishing all Analytics SegmentsStopping Import/Export workflows in Adobe CampaignStopping Adobe Target callsStopping DCM ...

One way to do this would be to put the two dates (Visit 1 date and purchase date) in the data layer. Then in Adobe Launch you could have a page load rule that fires on Order confirmation page that calculates the days between those two dates and puts it into an Conversion variable.

Dimension - Days before first purchaseThe ‘Days before first purchase’ dimension reports the number of days that pass between the first time a visitor reaches your site and when they make a purchase. For example, if a visitor makes a purchase one day after first visiting, then any subsequent visit o...

There could be multiple reasons for the same:Page view rule is fired twice. Hence whenever the page is loading it is taking double the count.There could be network binding error (NS Binding error) that click call is not getting triggered properly/ You can apply some delay in order to validate this.Y...