They're right. The seedlings have stretched. They do this indoors under light that is too far away, but they do it outdoors under sunlight, too. This isn't too unusual, 420. Some strains just want to grow . . . and these will get over it. But you might have a problem with those little girls falling over on you before the stem thickness catches up with the stretch (generally by the development of the 2nd node). Again, this is not too unusual. Build a little brace for them to lean on with toothpicks, bamboo skewers and pipe cleaners, or whatever similar items you prefer. When they're strong enough they'll lift off the brace and be fine.