What is growing on here ?

This is my 1st grow attempt ..
I have 3 plants (full story is in my thread "GROW DIARY" https://www.rollitup.org/newbie-central/179581-growing-diary.html) but as not everyone wants to read through all this I think I open a new thread and ask ...

one plant number 2 looks really odd ...
Some funny looking growth . Now for the sake of education I d like to ask the experienced growers what please is this ?

its only a malformed leaf i get them sometimes. no really a problem but you could trim it for vanitys sake