Hello! There aren't duplicate features in this case. There are two separate service buildings. You could see them on these two links:

https://www.bing.com/maps?cp=42.675526%7E23.302253&lvl=19.0&pi=-8.1&style=x&dir=111.8

and 

https://www.bing.com/maps?cp=42.675942%7E23.301597&lvl=19.0&pi=-5.4&style=x&dir=47.8

Also Bing imagery photos are more outdated in comparison with Esri World Imagery photos for Sofia.