[Solved]Collision problems

After the player and npc bodies collide, the player body passes below the npc body.
Any idea because this is happening?
The mass value is 80.0f and the gravity is -9.8f.
By the way I'm using the gravity in the setMassMatrix instead of the player mass because for some reason, this way when i increase the mass of the player he becomes heavier and more heavier he gets harder is to jump, this way is more realistic, for some reason when i use the gravity instead in setMassMatrix i can't see any changes in the jump when i change the player mass, this has nothing to do with the problem because i tried to use the mass and the player body still passes below the npc body.

Here is the code:

void cNonPlayerCollisionHandler::setCustomForceCallback(OgreNewt::Body *body, float t1, int t2)
{
Ogre::Vector3 force = cPhysicsInterface::getSingleton().getGravity() * mEntity->getMass();
cPhysicsInterface::getSingleton().addLocalForce(body,force, Ogre::Vector3::ZERO);
}

OgreNewt::PlayerController* cNonPlayerCollisionHandler::createNonPlayerController(Ogre::Entity *entity, Ogre::Vector3 size, Ogre::SceneNode *node)
{
Ogre::Vector3 inertia, offset;

OgreNewt::ConvexCollisionPtr col = cPhysicsInterface::getSingleton().createCollisionConvexHull(entity,0);
OgreNewt::Body* body = cPhysicsInterface::getSingleton().createOgreNewtBody(col);
cPhysicsInterface::getSingleton().calculateInertialMatrix(col,inertia,offset);

#ifdef OGRENEWT_NO_COLLISION_SHAREDPTR
delete col;
#endif
body->setContinuousCollisionMode(1);
cPhysicsInterface::getSingleton().assignBodyToNode(body,node);
cPhysicsInterface::getSingleton().setMassMatrix(body,cPhysicsInterface::getSingleton().getGravity().y,inertia);
cPhysicsInterface::getSingleton().setCenterOfMass(body,offset);
cPhysicsInterface::getSingleton().setPositionOrientation(body,Ogre::Vector3(0.0f, 0.0f, 0.0f), Ogre::Quaternion::IDENTITY);
// set the player to always be active
cPhysicsInterface::getSingleton().setAutoSleep(body,0);
body->setCustomForceAndTorqueCallback <cNonPlayerCollisionHandler>(&cNonPlayerCollisionHandler::setCustomForceCallback,this);
OgreNewt::PlayerController *mNonPlayerController = new OgreNewt::PlayerController(body, 0.4f);
return mNonPlayerController;

}

Thanks in advance!

While I haven't had a lot of time analyzing the code, it may be because the mass is much greater than 1 (Bullet recommends that you keep masses close to 1).

Again, I haven't used OgreNewt much and it could be totally acceptable in that engine. Hope this gives you some direction.

Thanks mate for your reply, i found the solution but i forgot to put it here sorry :S

The problem was the stairs factor of OgreNewt::playerController it must be near 0 because it's not working very well.