This looks like you've tried to plot a bandstructure, but you ran a DOS calculation rather than a bandstructure calculation. Because the k-point grid for a DOS calculation is a 3D grid, rather than a 1D path through the Brillouin zone, there isn't a neat way to line them up in a sensible path so Materials Studio just gives you this piecewise linear plot.

If you rerun this as a bandstructure calculation, you should get a sensible plot. As a side-note, Materials Studio also lets you plot a "DOS" from a bandstructure calculation - this is also a bad idea, but unfortunately it can be harder to notice this mistake.