There could be several reasons why Google Drive might report that you're using more data than you actually are. Here are some steps you can try to resolve this issue:
1. Check your Google Drive storage: Go to your Google Drive account and check your storage usage to see which files and folders are using the most space. This will help you identify if there are any large files or folders that you can remove to free up space.
2. Check for duplicate files: Duplicate files can cause Google Drive to report higher usage than actual. Check for duplicates by searching your Google Drive for files with the same name, and delete any duplicates you find.
3. Check for deleted files: If you have deleted a large file from your Google Drive account, it may still be counted towards your storage usage. To fix this, go to the trash folder in Google Drive and permanently delete any files that you no longer need.
4. Check for backups: Google Drive can backup your photos and videos, which can take up a lot of space. If you have Google Photos and Google Drive linked, you can check your backup settings and delete any unnecessary backups to free up space.
5. Try clearing your cache: Sometimes clearing your cache and cookies can resolve issues with incorrect usage reporting. To do this, go to your browser's settings and clear your cache and cookies.
6. Check for third-party apps: If you are using any third-party apps that integrate with Google Drive, they may be syncing or backing up data to your Google Drive account, which can contribute to incorrect usage reporting. Check the settings for any third-party apps you are using to see if they are connected to your Google Drive account, and disconnect them if you do not need them.
7. Check for shared files: If you have shared a file or folder with someone else and they have made changes to it, the changes can be synced to your Google Drive account, which can contribute to incorrect usage reporting. Check if you have any shared files or folders, and ask the people you have shared them with to make sure they are not using more space than necessary.
8. Check for malware: Malware can sometimes cause issues with Google Drive reporting. If you suspect that your computer or device may be infected with malware, run a full virus scan to remove any threats.
Try a different browser: Sometimes issues with Google Drive can be caused by your browser. Try accessing Google Drive using a different browser and see if the usage reporting is more accurate.
If none of these steps help, you can contact Google support for further assistance.