I am using the demo project only.
I can see that you changed the project , country.cs line 27 . from > 15 to < 15.
Fixing that so hasErrors is false as a starting point for all rows.
Then start by editing Mozambique to have a length > 15, then imideately tap to edit the population column in the same row.
No other steps needed.
This scenario was not shown in the video.
Then this happened:
HasErrors is true, the focus shifts to the populations field, no red warning bar.
I would have exspected:
HasError is true , focus still on name column , red warning bar displayed.
I am using IOS.