Can someone help with "Disappearing button" in prototype link sent and used on mobile browser?

Hi, I am facing this issue a lot lately. I test my screen on figma desktop prototype and it works fine. But when I send the prototype link and try to use it on a mobile browser, suddenly buttons disappear out of thin air. not able to understand why is this happening. Attaching screenshot. Pls help

Attached is an image of mobile browser. In figma desktop app there is a confirm and pay option button at the end.