13.5 number 2

I'm not sure what I am doing wrong? why do i keep getting it wrong, i've
reworked it a few times already.

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Well, what are you trying?  Let's see....you've done the divergences correctly, so that's not the problem.   Uh...wiki has this formula for the curl:

which is the same as ours...which for part A) gives curl(F)=-xi + (2y-(-y))j+(-2z)k, so it looks like you made an sign error leading to an arithmetic error in the j component.  In part B) you've done the curl correctly, so there was only the one error