Don’t know what are you doing talking about. I always play on mobile, and never have any issues like you have described. I use OnePlus 5 with Android 9 OS.
If this keeps happening to you, then it might be an issue related to your phone model, or OS version. I would suggest making a post in bug report forum with detailed information about your device.
Edit: after a quick look at bug forums, there does seem to be an issue with iOS devices that use a certain card back.
Known Issues List 2019 - Updated March 19th: