Looking closely at the pic, I can not see whether or not the box had been opened after he bought it. But I can see that the F— word is written in thinner icing than the LOVE WINS part.
I think you’re right about the different thickness of the word. It looks to be a slightly different tint as well.
The letter G is oddly shaped, too. They should get a printing sample from him in CAPS, with several Gs in it.
Upon closer scrutiny, the icing used to spell the slur is a different shade. Unlike the blue of the first two words, the slur leans toward a green. The brutha screwed up.