I wouldn't worry so much about them. I had the same thing on one of my girls but those leaves will end up being usless soon enough anyway. Just keep an eye on the new growth. But from what I can see your on your way to a nice plant. Feel free to follow my first grow so you can learn from the mistakes I've made and the good choices too! Cheers!
Hey there,for me I would check my water pH and run off to be around 6.5.Also if your potting mix is good ,I would only water just plain pH water and check if it becomes worse.