did they just grow in late flower? not larger, but actually grew new leaves? if nothing is new it is defintiely not a re-vege.
leaves will pop out with 2-3 lobes and look really funky, if it does re-vege. stems will elongate... might see what looks like dr grinspoon's weird traits (though not a trait in this context)
did you do anything odd with light intensity or light's distance from canopy (more likely earlier than later) -- lack of can cause extra leaves to grow, but that shouldn't happen late in bloom.
genetics... some plants just grow a shit ton of leaves, and futher influenced by environment.