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Okay, so I'm running a FB ad where the landing page is my website, not the Amazon Product page.
Recently, I started getting warning emails from my Web host service that I was exceeding the resources included in my "deal" and I needed to upgrade to handle the extra traffic. The cost was huge.
Like ... what?
After exchanging some puzzled emails (and getting a bit tetchy) I dug deep into my cpanel and stat's and sure enough, I was getting tens of thousands of "hits" a month ? apparently off-the-charts website traffic.
Facebook ads have a setting where it's allowed (by default, I think) to access external resources in the attempt to garner more impression ? note, impressions. And that external resource was my own website!
In otherwords, FB was pinging my own site with every impression, over a thousand every day, and the system sees that as traffic.
TBH, a friend figured this out for me and my explanation above may not be totally correct. Other settings on this particular ads were weird too ? such as my target audience age was nothing like I ever set. So I dunno if FB just changed stuff somehow because I missed some arbitrary "Let Meta decide for you ..." checkbox.