Cannot Edit published dates

Cannot edit published dates of the Plan Custom Post type created via the Advanced Classifieds and Directory Pro plugin, the issue also exist with default pages too, and not specific to the Pro plugin.

The following JS conflict is noticed in the console:
Uncaught TypeError: $(...).accordion is not a function

On running a plugin conflict test(partial), the error still exists. However, now the homepage isn't loading fine, and it acting bizarre after enabling the plugins.

Checking with the host to revert to it's backup, and will create a new staging site on which this could be troubleshooted further. Creating a ticket to follow up regarding the issue, and any queries that occurred during this chat. Please check the chat for more info.