Some kind of orange/yellow tint on first leave (on the indent)

I have attached a photo of one of the bottom leafs which seems to be turning a bit orange/yellow, it's not a bite, although at first glance I thought it was, but it's right on the leaf indent?

Yes, they are a little over watered, but are recovering. I am a newbie grower just learning the ropes. Plant is 17 days old. White Widow Auto

Temp MIN: 21 MAX 26 per day
RH 62-65
 

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