Do you see anything in either of the error logs, when the schedulers are supposed to have run?
(ie: suitecrm.log or the PHP error log?)
I haven’t used cPanel myself, so I’m not sure how much help I’ll be, but i’ve seen a few threads around it with varying levels of success, hopefully one of these has a solution?:
(or, at least, things to investigate that can give more info)
Some common suggestions seem to be:
Specify a full path to cron.php or the php executable in the cron job
ie:
(ie, in the 4th link above, a user noted they had to do this with cron.php)
Another thing to check is what web-server user Cron is running under.
There is a section in the config.php file, wherein you can specify web-server users that Cron is allowed to run on:
ie: