Field value not capture on form save in ServiceNow Portal(OOB Form Widget)

[AlwinJebakY]

In ServiceNow, I used the OOB Form Widget in the portal to display a form and view for specific table. 

Now the user is able to edit the fields, but when the user clicks Save, some field's value is not getting captured. 

That field's value is being set correctly through an OnChange client script and it displays properly on the form.

However, when the Save button is clicked, that field becomes empty. 

I checked no OnSubmit Client script is there and in a Before BR the field values are indeed empty. 

There are no ACLs restricting access
In Native UI it will be working perfectly, problem is in Portal only.

Could there be any other possible issue? 

[AlwinJebakY]

@nirwan_ritik Please check the ACL, sometime users not having write access of that particular field. and in portal are you using predefined save button or your custom button ?