I think I found a glitch on one of my old saves. Whenever I go to the Train Station to move to a new Town, the Buttom seems to be gray even though I got the current Town over 99%. Not sure If it is a bug or a maximum Town count had been added
Yeah this is probably the reason it happened. I was occupied with my first town with building my mansion while opening a Dizzy at my most recent Town without coming back to it.
