The Currency on the Subsidiary record suddenly changed

The Administrator is confident that the Currency set up on a Subsidiary is labelled 'CAD'. When the Subsidiary is viewed, the Currency field became 'PHP'.
 
The Currency field on the Subsidiary record cannot be edited after saving the Subsidiary record, regardless if there are no transactions and/or records associated to the Subsidiary yet.
 
The phenomenon described in detail above may happen when the Currency record is edited.

To further illustrate:

1. Create a Currency named 'CAD'

2. Create a Subsidiary and assign to it the CAD Currency

3. Edit the Currency Name from 'CAD' to 'PHP'

4. Open the Subsidiary record and refresh the internet browser

5. The Currency field on the Subsidiary record will now show 'PHP'