m0useanswered grow question 9 months ago Autos tends to start flowering aorund this time. week 4 to 6.
If they are small maybe they had a hard time as a sprout and did not get what they needed. or encountered to much stress "hst?" Autos in general have root issues from what I can tell, and if they are sharing the space with other plants and the other plants roots are more aggressive I've seen autos take a hit and get stunted in height.
Best you can do it let it go and try again. Maybe only have them in their own pots or plots, weed out any unwanted plants and give em lots of love n sun.
Good Luck!