According to your posted logs, the problem seems to be that both your /dev/nvme and your /dev/sda are set to bootable which makes it a sort of russian roulette which one will win (and it seems that the sda device is constantly winning)
According to your posted logs, the problem seems to be that both your /dev/nvme and your /dev/sda are set to bootable which makes it a sort of russian roulette which one will win (and it seems that the sda device is constantly winning)