Vicious Hammer glitch/exploit?

Well the first screen shows his % at a higher percentage than the 3rd Screen o_O.

1st Screen = 12.73% and 3rd Screen = 12.29%

So he could have just placed the screens in a different order, and he could have failed the 2 Hammered slots, so the gun would still be (+8) with 2 hammer slots used.

It's in a store in-game at the current moment.

Edit: I mean, I doubt this is an edited screenshot.