yea, that's what a few of my plants look like outside being re-vegged

I would say..
outdoor growing season change

growing outdoors, the plant can preflower for a long time before the seasons fully change to get the nice full flowers, even if it is 6.5 wks. those look like they are still in the vegging cycle with some enormous pre flowers. wait until the season fully changes and see if they explode.
could also be strain related
also you could feed it some 0-10-7 nutes or something to that effect, this will make more white flowers pop up, I use a 0-30-20 during flowering. twice. 1st week & 2-3 weeks before harvest