Hi Adam202,
The issue that you are describing happens when your Avast account has become corrupted. I'm sorry for any inconvenience that this may cause, but the only way to resolve this is for us to delete the account, and then you can recreate it under the same details.
Please confirm if it is okay for me to delete the account for you (as you cannot delete it yourself due to not being able to access the correct screens in the website).