Dented leaves, what could be the cause?

Pushing this back up because I still don't know what this really mean, hope you all can help <3
 
The leaf looks healthy, I've had a few push strange leaves. I figured it was something to do with genetics. It's almost like they just dont come out quite right. Hopefully someone else has a different idea!! My plants turned out fine just had a few weird leaves.
 
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