Added a pallisade gate to an already existing pallisade and after that, the tooltip for Pallisade Gate would show for every single thing I clicked on. This did not happen when placing the gate separately. I have not yet confirmed if reloading the game fixes it.
Edit: I can now confirm that re-loading the game did remove the first tool tip problem, however I then built a shelter and the same problem appeared again, this time with the shelter tool tip.