4-packs were never released with two of the same color (aside from Flesh). This 50/50 4-pack features two Flesh figures and two Magenta figures. This error is unique in that the figures are absolutely fine, but have been incorrectly packaged. This is only the second documented example, from a reputable source, of this error.
If you have M.U.S.C.L.E. figures with factory errors or damage, please email a short explanation and pictures to the University of M.U.S.C.L.E..
Figures with lesser errors and problems are highlighted in the section titled, The M.U.S.C.L.E. “Warp.”