Corvid coded shrinking header not working on the Instagram browser

Hello, I am sorry if this breaks the rules but I have a angry client with a issue that I have to fix right away. I coded them a shrinking header using Corvid. It works great besides on the Instagram browser. It might be all in app browsers but I haven’t checked others yet since the client took down the site for now. Does anyone know how I could fix this? any help is much appreciated.