Both try redownloading the latest build from the website, and copying one version of the dump to both computers without changing anything. I don't know what the issue is, but, for example, if you both got the same version, but from different branches, or compiled by different people, there may be some issue there. Also, if the right bit in the banner file in the .iso changed from 0 to 1 during copying, it could mess all this up.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
