YOU GOT ME COMRADE PHYSICIST!!!!
Unfortunately Atom Jerry has been informed of this discovery and is currently staring at the equation on the chalkboard upside down.
Yes, at this scale MeV and mass are basically the same thing. The problem is that Jerry's tiny Soviet science brain has a very limited number of drawers in his filing cabinet, so he put "stuff I throw at other stuff" in one drawer and "big boom juice" in another.
The scientists have submitted a correction request, but the paperwork was converted into energy before it reached the department.
Atom Jerry apologises for any crimes against physics. He promises to do better. He also promises he probably won't.
SMH indeed, comrade.