Cloudflare Server Error 500 - success_fraction - mobile connection to server API error

After enabling Cloudflare, everything seems to work fine. I notice when I am on WIFI (my mobile app), I can use my server API without problems. However, when I on mobile data (4G), my mobile app (i'ved also tested directly with API), it will return 500 error.

Here is the following error:

<h1>Server Error (500)</h1>
Response headers
 alt-svc: h3=":443"; ma=86400,h3-29=":443"; ma=86400 
 cf-cache-status: DYNAMIC 
 cf-ray: 74968a18ee948986-SIN 
 content-language: en 
 content-type: text/html 
 date: Mon,12 Sep 2022 06:20:49 GMT 
 nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800} 
 report-to: {"endpoints":[{"url":"https:\/\/\/report\/v3?s=XqpSLNdG070p90inA%2Fyz8fGLCaFJd8Ok0Q1LIX1DnZ8f1TB91QxK7C0akJOAxzWikVPGZ1%2BgGZplkOp7fo7Cx8rQDftwF6e%2FE9ZeoRHVrh6d%2BN9XidYUuwBFeAVsp5dmxQt1HrjXGxqY"}],"group":"cf-nel","max_age":604800} 
 server: cloudflare 
 vary: Origin,Accept-Language,Cookie 
 x-frame-options: SAMEORIGIN 

How can I solve this ? (FYI, I'ved not enabled any WAF firewall rules at all)

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