Curved Piping and simple bright rendering

Hi, when one applies curved piping on a curve, and the returns to a smaller radius, the outline of the bigger radius remains as a black line. This occurs with other views like “technical” and “pen” as well.

Though this doesn’t happen with “arctic” or shaded viewports.

Also, this refreshes if you close and open the file again.

what could possibly be the problem here?

peace and light.