Lower, larger fan leaves twisting sideways.

So I defoliated, and turned up my light a wee bit last night. This morning, leaves are turned sideways.......




Ive seen this before on another strain, a couple years back. It didn't seem detrimental, but I'm not positive that it isn't. Anybody know why this happens? I can't imagine, that they're sensing more light reflecting off of the walls, but again, I'm not positive.