Scrolling thru a menu "created" a row of pipes

I had the insulated pipe menu open and tried scrolling the list from the left to the right. The first screenshot shows you what I mean.

The pointer stayed in the same place and so did the options, but a row of construction pending pipe was laid. However, the game doesn't show any pending construction. This is shown in the pipes screenshot.

The pipes went away when I restarted the game. I don't have debug mode installed.