Hello.
So i never do this but i thing that the right way to transfer the modX page is first creating a backup:55
On Manager: Tools/ Backup
so next install modx in the new server and restore the backup, i don’t know if the backup going to move the files, if not just move the files folders independently.
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UNINSTALL:
i uninstall modx before a couple times and reinstall everything again in the seem hosting, just delete all the folders with an FTP software, that is all!!!
modx dont install anything in your cpanel or server software, ModX only install the things in folders and that’s all..
just delete everything and delete your database from your cpanel.
sorry for my english!!!

i hope you understand!
bye!