ghs super bud issues

Hi guys,i am on my first grow.......greenhouse seeds feminized.....they are 3 weeks into flower 4 plants grown in the Wilma 4 pot....2 plants are budding really well and the other 2 really are not up to much very very Small buds don't look like they have formed well at all......any ideas ??? :???: i will try to post pics later
 
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