Feet Not Touching After Move (Not Animated)

Hey guys I have a question maybe someone can help me with. After I import my avatar I place him on the ground and with his feet even on the ground and when I hit play his feet are still on the ground but when I move (still in the T pose just slidding) My avatar raises just a slight bit maybe like .50 on the y axis. The way I I setup the avatar is like this. I first import a first person controller from the standard assets. I then drag my avatar model onto scene and parent it to the first person controller then center it and delete the graphics option to get rid of the cylinder showing. Like I said everything is even on the ground until I start to move and then my character just slightly raises. If you can help me fix this problem would be most appreciated.. I've tried to search for the answer but most I come up with is just falling through the floor. Thank you if you can help me

Richie J