Typical weird auto with unstable genetics, would be my diagnosis, but I am very anti auto-flowering plants.
Try going to 12/12 and finish her flowering at 12/12 too.
Removing healthy green leaves will just reduce your plants ability to make energy, thereby slowing growth further and possibly leading to a smaller harvest too. If your plant did not need the leaves, it would not have grown them in the first place!
Next grow, try some "Sweet Seeds" seeds, they are exceptional and without any genetic problems. Some of their "fast versions" are almost as quick as autos, but will give you a vastly superior yield and without any problems.
Hope this helps und viele grusse ........
Organoman. (and anti defoliation advocate too!)