Shade cloth

I live in a desert climate, the sun is hot and relentless. I have not grown much inside or outside, only a few years with moderate success. Outside I built a PVC frame and covered it with 50% aluminet shade cloth. It seems to work good keeping the heat down on the plants and yet still seems to give them a good amount of light. I am having a problem and I do not understand it. I started some seeds inside and moved them outside Memorial weekend. They were only about 8 to 12 inches when I moved them outside. I have them in 10 gallon bags and pots. I have 4 in promix hp and 4 in empire. All are looking good and have grown nicely. My problem is I just returned home from being out of the country for 2 weeks and they are all in bud. They look nice but why are they in bud already?? I am confused and am wondering if the shade cloth could have something to do with this. The seeds are from reserva pravada, Kandy Kush and Dutch passion Blueberry and Critical Kush. They are good seeds not from some local seed slinger. I do not know what other information to give but if you would like anymore information please let me know what you think has happened.

first question is what time sun up and what time sun down? shade won't stimulate flowering. if it was 1 plant it would be easy to call it a duffer but they are all in flower. maybe they sent u auto's. can only be down to the light if not autos.

I live in southern california, The charts say I have 14hrs and 26 minutes of day light. they are not autos. I just talked to another friend who is not using shade cloth an has different seeds doing the same thing.

14hrs is obviously enough to put yr babies into flower

Look you said you started them inside right? How many hours light did you have inside? If you bring up a seedling under light longer than you are moving it to outside then it has a high chance of flowering.
That's to say if it started out under the same light hours it wouldn't be flowering but it noticed even at a tiny age the light drop when you moved them out