If you login to cPanel, what does it show there? If it shows correct in cPanel there's nothing to worry about, you have access to the full 1024 Mb disk space. Account panel will show correct as soon as it has synced up.
Now that you have been given an answer to your initial question, and you have not posted a response back in over 48 hours, I am going to close this thread to mark it as resolved. If you need more help or have any additional questions, feel free to create a new support request.