Anemic color and/or yellowing leaves or streaks in the corn leaves is a sure sign it needs nitrogen. Either the soil is too low in N or the soil has been overly cool and wet which makes N uptake difficult. Corn is a voracious N user.

Dave

What is odd is that ones inches away are perfect and bigger - entire garden is exactly same soil, fertilizer etc.

None of them in the pictures are perfect so can't comment on any others, only what is in the pics But corn requires 3-4x the nitrogen of any other vegetable garden plant so "same soil, fertilizer" as the rest of the garden wouldn't mean much to corn.

Dave