Whats causing this weird leaf growth?

Hiya
Got a few Strawberry Banana autos in the tent, 240w led, dwc, in the bucket pH 5.9 - 6.2 shes at about 400ppm of Canna Hydro A+B. Pretty major canoeing or whatever its called, temps 23° which is perhaps too low RH about 50% which is also perhaps too low.
Any ideas?
Thanks!

Nitrogen claw

Too much N

Yeah that's what I thought. Another girl same strain has the claw too. I dunno...is it really such a big issue? Does excess N cause problems absorbing other nutrients?

Any excess of an element can interfere with others.

Antagonism

Just tweak feed down - do not feed again for a bit , allow plant to work thru excess on its own ( it will be fine. )