Hey there! Congrats on starting your first grow with 9 plants, it's completely normal to hit a few bumps in the road when you're just starting out! Looking at the picture, that taller plant on the right is getting quite stretchy and "leggy," which usually means it's reaching for the light. To help with this, I'd highly recommend lowering your grow light a little closer to the canopy or turning up the intensity if your light is dimmable, as this will help tighten up the node spacing and stop them from stretching so much. Also, when it's time to transplant those into larger pots, you can safely bury the stems a bit deeper into the soil to give those leggy plants some much-needed extra support. You're doing a fine job so far, just keep adjusting and learning as you go!
Happy Growing Growmie🌱