One of my students is making a simulation of 4-wheeled skate and the results are strange

When i see the results of the velocity i see a complete red cutplot and the colorbar is changing

from 1 to 8 m/s.

In the pressure plot it seems that the flow goes straight through the skate and also the flow trajectories

seem to go through the skate and boot.

All the pictures are in the zip attachment.

Does anyone know what is wrong?

thx in advance