So i was testing 2.58f and i found the same problem with 2.58e, for some reason, this particular texture shows up inverted when converted from std mat to Octane Glossy Material, i say inverted because in trying to find why its was doing that, i ticked the "invert" tick in the Image texture map and it showed the right color...another test i did, i left "inverted" ticked off and just messed abut tiny bit with the specular color swatch and the texture showed up correctly in the Mat editor and also in the render...the odd thing is that it was just this texture that was suffering from this, if i create a new diffuse mat and apply the same texture to this material it does not have that problem, it shows ok, plz see pic for reference.
"Std_Fusca.jpg" file is the original Standard material prior to conversion,
"Oct_Fusca_Render.JPG" is after clicking convert button as u can see all reds show up bluish
"Oct_Fusca_Render1.JPG" is after playing abit with Specular color swatch.
I cannot thing of anything other than a Bug in this case

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Corei7, 6x GTX1070 (2 Inside and 4 in a CUBIX Xpander), 32GB Ram, Win10 64Bit Home, 3dsMax2017 64Bit, Octane for max 3 and LOVING IT!!!!
MSI GT72S 6QE Dominator Pro G win10Home, gtx 980m.