noise when shifting lower gears

[lostnavigator]

1500 Nomad 2003 when I first start my bike it shifts second and third ok but if I am in any gear and I give it a lot of throttle it acts as if it is shifting in passing gear like in a car. It will not do this when it is warmed up. Also when warmed up going from first to second and third it makes a sound like it is grinding gears. The only way I can go from first to second is when I go from first to second, to pull the clutch in when I hit neutral and let it go then pull it in again and no noise when it goes in gear. When I go to third pull the clutch in and pop the throttle and then it goes in gear quiet. The rest of the gears, no problem and down shifts all go in good. It is driving me nuts trying to determine exactly if it is clutch or what. It does not seem to be slipping.