In report A, only 7 gpus are detected by the bios which all work fine. In case there are really 8 plugged in, either one is broken or incorrectly seated or the mainboard/slot has issues.
In report B, one gpu reports issues in dmesg GPU 0000:3f:00.0: RmInitAdapter failed! (0x31:0x40:2476)
In case this occurs right after boot, it’s likely broken, please check if it works in another system.