Amazon Native Ad not showing up on WordPress

Hello,

I have this amazon Native Ad code:

<script type="text/javascript">
amzn_assoc_placement = "adunit0";
amzn_assoc_enable_interest_ads = "true";
amzn_assoc_tracking_id = "metainsp08-20";
amzn_assoc_ad_mode = "auto";
amzn_assoc_ad_type = "smart";
amzn_assoc_marketplace = "amazon";
amzn_assoc_region = "US";
amzn_assoc_linkid = "ec32b8a49706a77719569626260918d9";
</script>
<script src="//z-na.amazon-adsystem.com/widgets/onejs?MarketPlace=US"></script>

And I put it in the page i want to show it, but it doesn’t show up anything. Then I thought it might be due to WP rich text editor, so i put the code in header.php.

And this is the output:

[Large code excerpt removed by moderator per forum rules. Please use the pastebin for all large code excerpts. It works better anyway.]

Big ass HTML, but nothing is showing. I looked into the Insect Element stuff and i saw some elements are set to display none. But still, the elements are empty. Please help!