No it's not that.
Here's the scenario: Someone clicks your ad in Google, goes to your LP, clicks to the merchant page, then has second thoughts and bounces. They then do some more searching, find another affiliate's landing page, click through their link and actually buy. Google counts that as a conversion for you, because they have no idea whether that person bought right away from you or someone else.
All Google cares about is that the customer clicked on your adwords link, and then the pixel fired on the sale page. Anything that happens in between Big G doesn't give a shit about.