Why do you need a proxy setup in this case? Couldn’t you call the backend directly? Or is your backend proxying requests to another service?
Make sure you’ve deployed the same code you’re referring to in your frontend service on Render. If the requests are being rerouted to your frontend unexpectedly, double-check for any hardcoded strings in your code. Also, ensure you’re running the same frontend version locally and verify if it behaves the same way. This should help narrow down the issue.