Math Symbols Wrong

Choose an attack that hase a positive and negative attack number or just a negative one (e.g. 2/-7 or -4). On the Declare Attacks window it looks alright. When you get to the Resolve Attack window (lets say the die roll is 5) it shows 5 + 2 = 7; 5 + 7 = -2; 5 + 4 = 1.

Shouldn't the expressions be 5 + 2 = 7; 5 - 7 = -2; 5 - 4 = 1 or 5 + 2 = 7; 5 + -7 = -2; 5 + -4 = 1.

It was doing the math right but looked confusing, a couple of my players pointed it out to me and said that it had made them stop and think about it a few times.