If cPanel is displaying the wrong version of MySQL you'll need to access the filesystem for that particular user and remove/rename a file or two...
If cPanel is displaying the wrong version of MySQL, you'll need to:
Once in the directory, you should see a file that's named something along the lines of:
Just in case something blows up, go ahead and rename the file:
mv -v _usr_sbin_mysqld_--version _usr_sbin_mysqld_--version.bad
Once that's done, login to cPanel for that particular customer and the file will get re-created with the correct info