Those spikes apppear to be a set of planes Rhino’s drawing disappearing to a vanishing point. THey’re an anomalous artifact on an ortho view. They flicker with navigation but remain in the display (and print)
A correct depiction of this view is below:
Hello - without a file there is not much I can say - if you hide the figure on the right, do the spikes go away?
Haven’t tested without the figure. On reopening the file this morning the artifacts are gone. Maybe they’re only present when the Rhinoceros is tired. I’ll provide updates if they return.