Hello Gabz,
We've been testing it for a long time and we haven't seen this so let's check a few things.
As a first step, could you check if you're logged in to iCloud? On your computer go to System Preferences... > iCloud.
Do you see a checkmark next to iCloud Drive?
Then when you click on Options, is iReal Pro listed there?
In iCloud > Manage...
Do you see iReal Pro listed there?