Cache pool is showing checksum errors on both devices, this is most often caused by bad RAM, suggest running memtest.
Feb 9 16:44:48 UnRaid kernel: BTRFS info (device sdj1): bdev /dev/sdj1 errs: wr 0, rd 0, flush 0, corrupt 4, gen 0
Feb 9 16:44:48 UnRaid kernel: BTRFS info (device sdj1): bdev /dev/sdi1 errs: wr 0, rd 0, flush 0, corrupt 26, gen 0
The bad key order error is metadata corruption, possibly also from a flipped bit, to solve this (ideally after fixing what caused this in the first place) better to backup cache, reformat and restore.