Why do sims prefer coffee table over dining table and counter?

I don't know if TS4 content is still created the same way as in older games, but every object has a bhav code. This tells the game how the object will be used. Is it a particular table? If not, then it's possible the gurus coded coffee tables to also use the bhavs of counters etc. And or they just cloned a counter and textured it to be a coffee table (custom content can be created that way) and didn't think to remove the bhav code. Maybe someone should ask them if this is what they have done or if another cc table is messing up your game.