Beginner grower leaves non serrated?

Hello im a new grower and I plated some seeds in a pot about 2 weeds ago. I already have 3 seedlings but im a bit concerned as 2 of the seedlings leaves... I've noticed they're non serrated as seen in the picture and im a bit worried if that's ok since I've been looking it up and haven't seen/read about it. Most pictures and articles I've read look different and the same as my brothers. Is there anything wrong?
 

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An organic soil bag from heb? Idk what my brother chose but his plants look perfect! Ofcourse mine was same soil different batch of seeds. All my seeds seem to be growing the same way as well
 
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