It's hard to tell from the pics but the 8 wire motor looks like it's got 2 red wires going to A+.? You should have
A+ = Red & Blue
A - = Black & yellow
B+ = wht & brn
B - = Org & Grn

If correct then I have known some cheapp drives do strange things like this when the pulse is on the wrong side. So try changing the active state in Mach3 and see if it makes a difference.

Also what are you using for a parallel port cable.? It must be a straight thru cable not an old printer cable.!