Hey mate!
Yeah, looks like it has to do with the "grow environment" with that i mean temperature, humidity and light and light.
Your temp. seems to be pretty low, 25/26⁰C would be optimal.
Optimal humidity for vegetative growth would be around 60% RH
and last but not least, THE LIGHT, that plants need to be able to make the photosynthesis, that is the MAIN FACTOR.
For an autoflower 18 hours of light would be optimal, if the plant has never direct 🌞 sunlight or artificial light (lamps) then it will not grow properly, so, yes, if you wanna grow indoor you will probably need a Light Source.
Good luck 🍀