Unselectable areas in worldbuilding map

Trying to make a new world, I can only get about 3-4 areas into crewating in before I can't select any of the areas I've made to represent countries/regions. Tried multiple devices, multiple browsers, created 3 worlds froms scratch, even duplicated the world. Same issue appears at more random times when trying to modify the map of an existing map inside an active campaign, whether I created the world, or it's someone elses shared world