I did notice that but since I've never seen another HIT mighty Mac I'm unable to ascertain whether this is normal or a variant. I hope it's normal because I don't care for variants since I don't care about higher resell value of my collection. But only time will tell when I get to see another HIT Mighty Mac (but with you around it might take just another day lol).
The fact that nobody (so far) can show pictures to have one still confirms to me that Hit Mighty Mac is difficult to procure. I do want someone now to show me the underside of their Hit Mighty Mac so I can see if the labeling is normal since you brought it up though.