You're probably using wrong version with wrong settings
If you want to use debug libraries you have to set your compiler to debug (then it will automatically make needed changes)
For instance,
Project->Properties->Configuration Manager -> Configuration >> Debug
and then down in Linker -> Input you should get
sfml-main-d.lib
sfml-window-s-d.lib
sfml-system-s-d.lib
and if you change it to Release you should get
sfml-main.lib
sfml-system-s.lib
sfml-window-s.lib
Hope it help,
Cheers