PLEASE HELP - Plant bending after transplant

I have a few 3 1/2 week old super lemon haze plants between about 7 -10 inches each. I just moved them from 3 quart pots to 2 gallon pots. Most of them are doing awesome and look like they have grown within the few hours since I transplanted them. One however has me worried. A few hours after the first watering since they were transplanted I checked the soil and it seemed kind of dry so I added a little water to each plant (maybe a cup and a half to two cups per plant). I came back to check on the plants thirty minutes later and one of them was bending over basically in kind of an upside down capital L shape. The plants have been doing extremely well and the stalks are very thick. The bend is not a bend like someone accidentally bent it and it left a crease. The plant is still very stable and I can bend it back straight and it will slowly bend back down. What could be causing this and what should I do.

BTW I have 10 plants that are currently in 2 gallon pots under a 1000 w HPS which is about 30 inches from the plants (to far or to close?) and am using advanced nutrients sensi-grow (during vegitation, will be using sensi-bloom during flowering) every 3 waterings at half strength (or about 1.75 - 2 ml per liter) My phone is my camera and it is charging now but if it is still leaning when it finishes I will post a pic or 2, but hopefully it is just shock and it will come back quickly.

Also if anyone has any ideas on how to better regulate my temperature inside the room I would greatly appreciate it. The grow room stays about 10 - 12 degrees hotter than the rest of the house which means that to cool it down I have to turn on the central air which also cools the rest of the house down an additional 10 degrees and while its perfect in the grow room its kinda chilly in the rest of the house. I have four fans going, a big fan blowing from a top corner of the room, 2 oscillating fans on either side of the plants and a normal fan blowing around the lower parts to refresh the air around the stems.

Any and all help is greatly appreciated - MORE INFO IN MY JOURNAL

Tie it or stake it up till it recovers. Or leave it bent as a self created supercrop

To draw the heat out of the room, use an inline fan and a long length of ducting to move warm air to another part of the house. Cools the grow room and you get free heat somewhere else. cn

That option isn't really good for me because the owner of the house will not let me cut any kind of holes whatsoever in either the walls or ceilings, that is why I am in the predicament I am in. One thing it is cold outside and I can crack the window and the fan pulls in cold air cooling the room down pretty fast. The only problem with that is when I close the window the temperature goes back up pretty fast and I can leave the window cracked during the day because it is light out and you cant really see the bright light but at night it throws a very odd or abnormal color of light out of the crack of the window. I am really exasperated, I need to find a solution to this problem that is going to satisfy the owner and not give off unwanted signals.

Its fine, I just transplanted my Super Lemon Haze and it did the same thing as well, also the upper leaves "rolled up" as well. Mine pulled out of it pretty much the next day.

should be fine bro but if you want it to stand up straight just stake it up til its where you want it

Stake it up, have a small fan blow lightly on them. The movement will cause the stem to grow thicker and stronger.