I have 2 of the exact same going, and also my first autos. One popped over a day before the other, and is still ahead of the other. To answer your question yours looks inline with what mine did. I transplanted early on, so that may be a bit of it if they were stretching for roots, but at 25 days since they popped they're doing well in 3 gallon fabric pots, and If I wouldn't of bent them doing LST the biggest might be 12" tall. The stem seemed flimsy till I bent it, and got some light on it. It near double in diameter in 2 or 3 days. There are really taking off now, but I fear I won't have enough time to get any size from them. My Fast buds OG kush auto seemed in limbo for the same week or so my BB'S were floundering IMO. I'm hoping both strains run longer than advertised

Hope that helps............