MERN backend not working on other computers after deploying

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I deployed my MERN stack app on Render. It’s a flight management app and when I go to the website on my computer, I’m able to add new flight information and it displays it on the homepage. When I open the site on another computer it also displays the information I added, but when I try to add new flight data, it won’t add it.

I originally thought it was an issue with MongoDB, so I allowed access from anywhere on it but that did not solve the problem.

Does anyone know what might be causing this?

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