Kerbal Space Program

In the SPH using either the MK2 Liquid or Rocket Fuel fuselages the graphic that denotes the "top" of the tank, the portion with the little outline of a hatch of some sort, will allow rotation of 90 degrees, but the moment it passes 90 degrees, the texture snaps back to the original orientation. I do not think this is the part itself, but only the texture, as I myself did not see the part snapping back, only the graphic texture itself. I do not see this behavior inside the VAB.