/scripts/securetmp adjusts the size of your /tmp partition, as well as adjusts your server's /tmp mount settings. If the Server Administrator makes customizations to /tmp's mount, the changes would be overridden by the script.
To disable the securetmp, execute the script:
When the following prompt appears, enter "y" to disable the script:
Would you like to disable securetmp from the system startup? (y/n) y
Lastly, create the following touch file to disable its execution entirely:
mkdir -p /var/cpanel/disabled ; touch /var/cpanel/disabled/securetmp
We have this information on our documentation here as well.