Google Tag Manager and FB Pixel not loading on checkout page

Hi, 

We are facing a major concern right now with our website and its related to Google Tag Manager and Facebook Conversion API integration. 

Neither Facebook Pixel nor Google Tag Manager is loading up on our checkout page. Here are the screenshot while on the cart page  - 

Here we are on the checkout page - 

I reached out to Squarespace's customer support and their response was mind-numbing tbh. This is the response I got - 

"Unfortunately, Squarespace does not support tracking events through these custom codes. Please try to use Squarespace Analytics or Google Analytics for keeping a track of events. We would not be able to provide further support related to custom codes due to their complex and unique nature."

If this is the case then I would really prefer to move to Shopify because not being able to keep a track of purchases being made through FB purchase funnel throws our ROI calculations and entire marketing strategy out of the window. 

Any way to fix this?

Were you ever able to get any resolution on this topic? I am having the same problem and it's getting expensive. Our workaround has been to use "Add to Cart" for the event, but Facebook is returning a significantly higher number here than we are seeing even on SS Analytics (some of this is due to Facebook's modeling vs. real #s).