PsiCop

Here it is . The town that can't build the Hedge Wall is Noreri. Thank you for looking into this. The game is a lot of fun despite this minor issue, so thank you for that too.

I have seen the same thing the OP shows. It seemed to happen when I didn't have one of my cities in view, and then when I moved over/scrolled out to see the city it suddenly had a rival city's UI, symbol, color, and name.

I think this is a bug. I have multiple level 2 cities, but I can only build a Hedge Wall in some of them. I have the necessary resources, but in some of my cities the button to build a Hedge Wall is greyed out, even though none of the resource requirements are listed in red. In other cities, the button is selectable. Playing in 1.05, but it was a game I started in 1.01 (not sure if that matters).