Problem with simulink 3Dof

Hi,

I am having problem simulating a pretty simple balistic trajectory with the 3Dof block. I have a thrust 600N that a certain point becomes zero. When I open the scope connected to to X,Z coordinates it gives me an exponential growing for all the time, with a simulation time of 1000s enough to see the overall trajectory. If I put 3DoF Animation, the animation is correct(showing the ballistic trajectory as it should be) so why the scope show this wrnog data on X,Z ? And how I solve it