Hi
Please, check your imagery sources, The city of Kiruna is moving large parts of the town and lots of buildings have been demolished or moved.

Double check with[1], we are allowed to use the imagery as a reference but not incorporate it in to our tools.

Perhaps you should exclude the Kirina area from the missing building detection, you are running. 

[1] https://minkarta.lantmateriet.se/plats/3006/v1.0/?e=719687&n=7535061&z=13&mapprofile=flygbild&background=2&boundaries=false