You can check if this is your case by running the following via SSH:
Code:
cd /scripts
wget http://httpupdate.cpanel.net/autofixer/check_bwdaily
chmod +x check_bwdaily
./check_bwdaily --all
If the script reports different results between the normal bandwidth and the one shown, then run the following:
Code:
cd /scripts
wget http://httpupdate.cpanel.net/autofixer/correct_bwdaily
chmod +x correct_bwdaily
./correct_bwdaily --all
After the last command, run /scripts/check_bwdaily --all again to see if the problem has vanished. If the problem is gone, then allow several hours for the normal bandwidth to be shown in cPanel and WHM.
Let me know if that helps.