Velocity under stationary particle

Hi everyone,
I am trying to simulate a flow around a single stationary spherical particle, using IBM method. With force models ShirgaonkarIB and ArchimedesIB. However there seems to be a problem with the coupling data, eventhough the particle isn't moving, when I check for flow velocity in paraview, the velocity where the particle is located does not go down to zero. Does anyone have any ideas about why it can be? Is it because of the coupling properties that I use or is it because of numerical reasons that it doesn't become zero? Did anyone else have this problem?
Thanks and regards,