Why are these hollyhock leaves all different

Hi all
These hollyhocks were all grown from the same seed packet.
They’re all planted in the same place
Can anyone tell me why they all have different shapes of leaves?
Thanks

 

I'd guess it is just natural variability. Were the seeds from a mixed packet, or a specific variety?

 

Now you’ve said it they may have been mixed Bob!

 

They look very healthy - look forward to seeing some flowers (might be next year, though.)
Mine always get rust whenever I try to grow them now.
Yours show no sign!