Custom Field Mapping MP to Joomla

Hi Tuan.

I have a question regarding Joomla Custom Fields and mapping within Membership Pro.

I created a custom Joomla text field to attach to the user profile (User > Fields > New).
 

I then created a custom field in MP and have it mapped to the Joomla custom field.
 

When a user registers for the first time on the site and enters information into this custom field, the custom field within the Joomla user profile successfully populates - yay!

However, the issue I've found is this field won't update if a change is made. For example, once a user logs in and retrieves their MP profile, the field is available to edit. When the user modifies the contents of the field and selects Update, the field within MP is updated correctly, however, the mapped field to the Joomla custom field doesn't update.

If I log in to the backend of MP and update the user record for this field within MP, it will then update the Joomla custom field.

It appears users are able to update the field to MP, but the update does not reflect in the user's Joomla account record.

As always, thanks your assistance!

Tim