Website favicon not appearing on iPhone 6 (Home Screen)

I'm using the syntax as generated by realfavicongenerator.net to specify all favicon sizes, yet for some reason the icon is not displaying on iPhone 6 (3 separate devices, browser cached cleared). It is showing a screenshot of the site instead. Any ideas why this is happening?

I've looked at every article I could find on the latest syntax, and iPhone 6 should be using the sizes specified. Running the favicon checker shows green across the board. I've triple checked the that all the links in the source are correct.

<!--Favicon and Apple Touch Icons-->
<link rel="apple-touch-icon" sizes="57x57" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/apple-touch-icon-57x57.png?18609">
<link rel="apple-touch-icon" sizes="60x60" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/apple-touch-icon-60x60.png?18609">
<link rel="apple-touch-icon" sizes="72x72" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/apple-touch-icon-72x72.png?18609">
<link rel="apple-touch-icon" sizes="76x76" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/apple-touch-icon-76x76.png?18609">
<link rel="apple-touch-icon" sizes="114x114" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/apple-touch-icon-114x114.png?18609">
<link rel="apple-touch-icon" sizes="120x120" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/apple-touch-icon-120x120.png?18609">
<link rel="apple-touch-icon" sizes="144x144" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/apple-touch-icon-144x144.png?18609">
<link rel="apple-touch-icon" sizes="152x152" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/apple-touch-icon-152x152.png?18609">
<link rel="apple-touch-icon" sizes="180x180" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/apple-touch-icon-180x180.png?18609">
<link rel="icon" type="image/png" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/favicon-32x32.png?18609" sizes="32x32">
<link rel="icon" type="image/png" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/favicon-192x192.png?18609" sizes="192x192">
<link rel="icon" type="image/png" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/favicon-160x160.png?18609" sizes="160x160">
<link rel="icon" type="image/png" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/favicon-96x96.png?18609" sizes="96x96">
<link rel="icon" type="image/png" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/favicon-16x16.png?18609" sizes="16x16">
<link rel="shortcut icon" href="//cdn.shopify.com/s/files/1/0171/0160/t/3/assets/favicon.ico?18609">

(The website is troubadourgoods.com and is in Shopify)