Made a USB Live stick for Elementary OS with rufus-3.11 in Windows 10, tested USB stick with kubuntu-20.04-desktop-amd64 and verified that it works to install with on same PC, and it is no problem installing Kubuntu. Tried downloading elementaryos-5.1-stable.20200706 ISO again.
Computer is with ASUS X570 motherboard, Ryzen 7 CPU, Radeon RX 5600 XT GPU, one 500 GB NVMe M.2 SSD, and one 2 TB SATA HDD. Tried different fs on USB also.
What is wrong, can you find out from photo of my monitor during install?