Browning leafs in seedling?

Hey guys, my second post here, just wondering what this browning is with my new leaves coming up?

My plant stopped growing for a whole week, the humidity was down to about 25% so I boosted it up to 40% and it has started growing but now it has these weird browning parts coming through, so Im just wondering if I should be worried about it at all?

Also link to my old question

They look just fine, not an issue
Dr. Jekyll

I doubt the boast in humidity made any difference, seedlings take time to develop above ground, as establishing their roots is a higher priority
Mr. Hyde