I have gone through 3 grows using the OF and had issues every time..
I tried adding nutes. I went with just water... Light nutes.. Never mattered... Using the Strawberry Fields from them now, same strain without the issues..
That being said you have nothing to get too worried about... Im smoking some GG#4 that is delicious and potent... Had severe nute burn all over it...
My ph was low and my nutrients mix smell could have affect ph, fresh nutrients every time and phed water, she's pulling well