MCP App UI causes chat to be jittery on mobile but not on desktop

I have two MCP App UI’s that I’ve built for my ChatGPT App. One of them works fine on both mobile and desktop but the other one causes the chat screen on mobile to generate a bunch of white space and scrolling below the app UI. When you scroll down to see the ChatGPT generated text for the chat, it’s also jittery. This doesn’t happen on desktop for ChatGPT. This works without issue on both mobile and desktop for Claude, so I’m guessing that perhaps it’s an issue on the mobile side for ChatGPT. Maybe it keeps adjusting the iframe size? Anyone else experiencing something similar and find a workaround for this? Mobile: