GG#4 more stretch than WW ?

2 weeks into 12/12, my WW plant is stretching less than my GG#4 plants. All grown from seed, my three GG#4's showed different pheno's during veg, but now deep into stretch have all pretty much evened up. My WW is a few inches lower and i was wondering if this is normal?

2 different strains some stretch more than others I wouldn't worry

Thx for reply, managed to raise the WW up a few inches without detaching it from the screen so all now at about even height.