I have not seen any other Malva flowering now and I think they are almost gone done for rest
It does not look solanum to me but very Malva and in the first picture of the second posting by Roma there are leaves that are similar. On the Malva moschata alba
It might not be alien but for sure hybrids if it came from a garden as it is not a normal Swedish October plant.
I tried to find "normal summer flowering Malva in my parents garden but could not see them. Maybe due to it was too dark as well.
I will look to see if it sets seeds
If so I will update with the seed photo
Thanks for Your inputs
Joakim