Week 2 of flower and no stretch is normal for some strains they’re just short, bushy phenotypes. But if they were supposed to stretch and didn’t, it could be light distance, temperature, or genetics. The dense veg is good though. Keep an eye on bud development if the buds are forming solid, you’re fine. If they’re not fattening up, you might need to check your light intensity or flip your timing if you haven’t already.