I have the same problem with my Kirk L-bracket on my D800e. The same problem also occurs with the Kirk L-brackets on my D4, D300, and D90. I've just learned to live with it.
Gary in SE Michigan, USA. Nikonians membership - My most important photographic investment, after the camera. D4, D810, D300 (720nm IR conversion), D90, F6, FM3a (black), FM2n (chrome) YashicaMat 124, Graflex Speed Graphic 4x5 My Nikonians Gallery & Our Chapter Gallery