hey bro- blueberry grow here too. Where are the seeds from? Mine are from dutch passion and I have the same thing going on. at this point, im guessing my insight wont help you a lot- but if you havent gone into flower yet I would like to put my two cents in. My first thought is the genetics could be a little unstable- If your grow is Dutch Passion seeds and we have the same problem then.......... Another thing could be stress from several places as i experience myself. I stared feeding the tiny plants too soon and this caused purple stems( nute lockup). Did you start feeding them full strength nutes. I finally got things dialed in and beside crazy growth and extra fan leaves growing off each node everything is fine now. The best thing to do at this point if the leaves bother you- is top them and get ride of those leave. I did this myself and that worked for now anyway. No major issues. Also I running top drip rockwool and hydroton so the medium is different but close to the same thing going on as far as leaves are concerned. Anyway everything seems fine here where im at two weeks later so I would not worry. Just top them, I read somewhere that blueberry is a strain that this is beneficial to do. Check out my post MUTANT BLUEBERRY and you can see my plant as of a couple weeks ago. Now more that triple the size they were then. All my blueberry have three fan leave on each node and i think this is supposed to be good..........I hope any way. Please just answer me back on my post as to where you seeds are from, especially if they are dutch passion