24VDC POWER SUPPLY

I have many surplus switching power supply adaptor
output at 24VDC 2amp. I connect 2 pcs in parallel
with diod in5 at the positive end supply to the GECKO 320
running a DC motor at 3.5 amp using Turbocnc and run it
for many hours. The end results is 1 is hotter than the other
the output measured 2 amp. Funny 2+2= 4, howcome 2+2=2
Any power supply experts out there can advice me.