UPDATE: We have identified the issue and all users progress will be restored in the next app update which will be available in the next 24 hours.
If you do not have auto updates turned on then you will find the update in your app store.
There is a current issue affecting the app where users may not be able to see their progress.
We understand how frustrating this is and we are actively working towards a solution as quickly as possible.
We’ll post an update here in a few hours.
We sincerely apologize for the inconvenience and appreciate your patience and understanding.
— The Studycat Team