An interesting artefact I came across while modeling

I was just doing some simple edits to a file and came across this interesting artefact
When I move the last control point of the curve by 1/4" the curve goes crazy.

View from a distance

The coordinates of that point is (1.0008e+06,212003,23.9934)
Would anyone know if this math related, overflow error, bug?

Have you tried moving your object closer to world origin? It is pretty far away from w0,0,0.