Hey
@GreenCasper !
I had exactly the same problem in my ongoing grow at a earlier stage.
Looked like crazy for days for bugs and pests, and conclude some leaves were just coming that way.
Can be also if you have more plants growing around, or against the walls of the grow, where the leaves can't grow the same, natural way.
But, it's always good to search for anything alive here, you never know, even though bugs would not only eat the tips of the leaves ;)
cheers