Hi,
It could be one of the following (that's what i can think of):
1. You didn't move the code properly, please look at the code in both and make sure it's the same
2. It's a security issue
3. You have a customized code that maybe hides this tab in a certain condition
Regarding your question in one of the replies on how to make the tab only visible to sysAdmin and HumanResources roles:
SysAdmin can see everything by default
For other roles, there is a property for the tab called "NeededPermission" which have those values: Read, Update, Correct, Delete, Manual
For example, if you put the value as "Delete", then a user that only has read access to the form, when they enter the form, then they won't be able to see the tab. If any user has delete access to the form, then they will see it.
Now if you put the value as "Manual", then u need to specify which privileges or roles can see this tab otherwise no one will see it except for sysAdmin of course. So you need to add this form control under the permission node of the privilege OR under the permission node of the security role in order to be seen by others.
Thanks,
Layan Jweihan
Please mark this answer as "Verified" if it solved your issue. In order to help others who will face a similar issue in the future