Injected code making my website not secure.

Site URL: http://www.reinkegoldmining.com

I made a site and it says that it is not secure when viewed, I have the SSL turned on. Squarespace says that it is because I injected code. Only code I injected was some Amazon affiliates program ads. Other then that I put no code in. Are there other reasons the site will be shown as not secure? Is Amazon code often an issue on squarespace? Please help I am at a total loss and about to give up on squarespace and find another site that will help me. Squarespace has denied me support because they say the issue is the custom code from Amazon. I see sites all over using Amazon code and the affiliates program and their sites are shown as secure. I am beyond pissed and really need some help. I am hoping the community here is better then Squarespace support. Thanks for any help.

In the code injection that you used, are there any plain "http" links in it? If there are, change those to https and see if that helps fix the issue

Thank you I will look into that

I looked and no http at all, here is an example of the code I injected

<script type="text/javascript">
amzn_assoc_placement = "adunit0";
amzn_assoc_tracking_id = "reinkegoldmin-20";
amzn_assoc_ad_mode = "search";
amzn_assoc_ad_type = "smart";
amzn_assoc_marketplace = "amazon";
amzn_assoc_region = "US";
amzn_assoc_default_search_phrase = "Garrett Gold Pan";
amzn_assoc_default_category = "All";
amzn_assoc_linkid = "1b8dd746441f739e78c4216453215842";
amzn_assoc_search_bar = "true";
amzn_assoc_search_bar_position = "top";
amzn_assoc_title = "";
</script>
<script src="//z-na.amazon-adsystem.com/widgets/onejs?MarketPlace=US"></script>

Try change this link to https

//z-na.amazon-adsystem.com/widgets/onejs?MarketPlace=US

https://z-na.amazon-adsystem.com/widgets/onejs?MarketPlace=US