Grounds in my coffee

First of all I'm not sure if I selected the right kind of keurig, I've scoured the machine and the manuals and all it says is Keurig K-classic which is not one of the options so I picked the one that it looks like. I'm having lots of grounds in my coffee and black residue at the bottom of the cup. I've already cleaned the needles twice and nothing comes out, I run a water cycle after and nothing comes out but if I brew a K cup theres grounds. I even cleaned and descaled the entire machine and I'm still having grounds and residue. I also replaced the water filter. Please help