Staff Room - changing object colours swaps colours of other objects

Hi! When I go in to edit mode of the Staff Room, and swap the colour of an object, & then save the new colour scheme, other objects from that room which I did not select will also change to a random colour once saving & exiting the 'edit room' mode. This will generally continue to happen multiple times in a row until I properly save & exit/close the game, & restart again. This sometimes also occurs in other room types, though is most common when editing the Staff Room.