How strange: I can’t actually replicate this – if I set the default country as Indonesia then the state/province field is left as an empty text field (it is not a drop down of American states) and that is true whether I’m in the event or venue editor.
Can you confirm where you are seeing this exactly and if both The Events Calendar and Events Calendar PRO are fully up-to-date?
Can you also confirm if this happens even when no other plugins but ours are active and only a default, unmodified theme is running? It’s not impossible another product is looking for country and state fields and is prepopulating them for some reason.
Thanks!