Default [Q] Unknown phones under Android Device Manager

Today, in my Android Device Manager under Google Play on my computer, i noticed that on my list i have phones that i dont even own. I have location from them and i can also lock them. there is a GT-N7000 and SM-G900T. Is this a bug or what? XD

Samsung Galaxy W GT-i8150 || DarkCM 4.4.4 || K^Kernel 390mb RAM. || @1.6GHz SmartassV2 + BFQ and a motherload of tweaks = ~20 FPS Playable heavy games (Real Racing 3)

Samsung Galaxy S4 Mini GT-i9195 || Stock ROM 4.2.2 || No custom kernels/tweaks