RestTemplate responding gibberish when proxied

When NOT proxied DNS reccords, our Webapp works fine, as soon as the Cloudflare security is enabled our api call RestTemplate responds gibberish.

WAF managed rules are on logging mode so those do not interfere but as soon as it gets proxied stops working.

We are onboarding our domains to CF and this happens in every domain, since we started the process.

Images attached reflect responses with the site security enabled (ON) & Disabled (OFF)