Is the ISO the disc from MS or one you made?I have tried to load 10 with 2 USB sticks and the iso disc and they won't work.The memory is Kingston HyperX FURY 8GB 1866MHz DDR3 CL10 DIMM - Black (HX318C10FB/8).
If you made the disc and two flash drives with the tool your download may have been corrupted. I'm unsure if it redownloads the OS data each time you create a USB/disc or just downloads it once. If it just does it once your download could be corrupted and cause that issue on all of them. I'd start afresh and make a new flash drive if you can just to be sure.One I made from the MS download site.