ostheerI am really frustrated by the fact that when enemies step on Wehrmacht placed S-Mines that they count as personnel losses. Can any Vet out there give me some insight on this please? 
S Mines are "Killed" like youve figured out already.
Have you noticed that when a tank shoots the mines and clears them out on accident it says "enemy down"
It has to do with the fact that Mines,tank traps,barbed wire,infantry,tanks,unfinished bunkers,trenches,are all technically units,that are produced,and therefore and count against your Kill death ratio.
Honestly i wouldnt stress too much over it...looking at the stats post game never tells the whole story. Ever. If someones calling you a noob because of this ruining your K/D,inform them of this reply and call them a noob right back.
Same sort of thing with Damage Dealt,It counts every little silly thing that can be destroyed.
If you want feedback from the game you just played just watch the replay and learn from that. stats wont tell you much even if it wasnt bugged.