At a Corporate Ice Farm I bought everything and undocked. I visited again and sold some items then I went to the buy screen (having forgotten about buying everything), only to be shown the items I sold with some dockscreen elements missing.
I can select the items and they all give a readout of unit price (no value given), mass and markup (0 credits), and all say "This item is not for sale."
To escape I can Esc out of the buy screen without selecting an item, or I can select an item and hit [D]one.

It seems like it only happens when it has items but nothing to sell to me. This glitch happens whether or not I have items to sell to the station.

The glitch has been seen at:

• a Corporate ice farm (badbuyscreen.jpg, badbuyscreenselected.jpg)
• a Commonwealth medical colony (crickweird.jpg)
• a Corporate fuel depot (jerryweird.jpg)

Have my save if you need it.