Oh see there was a misunderstanding, I thought you asked for experienced eyes - not growers. Was just telling what my experienced eyes saw.Huh... Hadnt noticed that. Clearly im on the wrong forum. Looking for grow help not sarcasm. I misjudged this forum. My error.
Jokes aside - You fim'd your plant which means the new growth you cut is still able to grow but it will be stunted as it tries to heal while the other tops get most of the plants energy to grow upwards. The reason it's taking so long is because you have very low levels of light. It looks like you're using maybe 50w total in there, ideally you want around 100-150 minimum. Grab yourself 4 40w cfls for $20.
Also google space buckets for some good knowledge on small scale growing with clfs/leds. Or just go here http://www.growweedeasy.com/marijuana-space-buckets
Use the base information from there to apply to your setup.