The fact that you had two 7d's with the same issue makes me wonder if it isn't batch related (like the white grip problem with the 5d3). Either that or it has something to do with the fact they're refurbished. It's certainly possible that a technician is making the same mistake on each camera he/she handles. This is especially common when someone new is hired and in training, or when someone is moved from one position to another (i.e. not used to working with the 7d). It will be interesting to hear whether your third camera has the same problem or not.