Hi, I am Dave, I will help you with this.
Open the Settings App, then go to Time and Language - Language and Region
What Display Language is set there, and what Region is set there on that PC?
Click Administrative Language Settings
On the resulting dialog, click 'Copy Settings'
Check the boxes at the bottom of the next dialog for 'New User Accounts' and 'Welcome Screen.....' and save those settings
Then check if that solves the problem