I think your probably right man ! A few of my ladies did that too ! At first I thought it was strain but had another plant near of the same strain that did not do this top head bud stretch ! Well I hope there's no male pods in there dude because that plant that did this weird top head bud stretch thing I found poped male pods . And the strange thing was that I found them only around the top where the stretch was . If you don't get these then I would have to say its the strain . Or you have a very resilient fem strain that's not hermi prone .