I am not sure if its a bug or you just need to be conscious about it.
I have been playing around with the Rhinosun in the API and I was getting incorrect sun positions until I realised that the main drivers is the Timezone (or one of the drivers) and that you can have the city correct but with a different timezone.
I understand that is an user error, but I believe there could be some kind of check or check-box to get the correct timezone automatically. Or the ability to load a weather file.
Best,
M