Translational Displacement drifting from sine wave velocity input

Hello, I have a sine wave input connected to port S of an Ideal Translational Velocity Source, Port C is connected to ground, and port R to a Translational Mechanical Converter. Instead of the displacement at Port R being a constant sine wave, the displacement value gradually drifts over time. Does anyone know why or how to stop it?

Edit: Couldnt put more tags or the product in: If I try to put Simulink as the product and add a tag, the site crashes.

[Nachiket Bapat]

need to change the simulation solver from variable step to fixed step. Mention step size 1e-3