Cura creating invalid gcode, files have large gap

[Danimosity 0]

 I have imported several models into Cura and it seems to slice them just fine and I saved them on my HD as gcode. Then when I got to load the gcode files up again with Cura it says that they are invalid. When I load the gcode files with a different program it shows that the files have several layers missing from the sliced model. When I attempt to print these files it stops right where the gap is shown to be. I can provide an .stl file and the resulting invalid gcode file created by Cura.