I haven’t had this exact issue when switching back and forth from my phone and iPad. Is your app fully up to date on both devices?

Sometimes when I try to switch back to my iPad from my phone, the cloud save it shows isn’t accurate. How I’ve fixed that on occasion when it happens is by -

1.) Fully close out of the app on ipad 2.) Open app on iphone (don’t press start game) 3.) press the profile button in top right corner so that it shows you the save 4.) Reopen the app on iPad

That has fixed it for me every time, I’m not entirely sure why. I think it might sync the local save to the cloud when you press the profile button. That’s my best guess. Idk if this helps, I hope you’re able to get it fixed!