Just noticed your syslog says you have an unclean shutdown and the resulting parity check is underway. Did you reboot from the webUI? You must always reboot or shutdown from the webUI. Unless Unraid can stop the array before power is removed or reboot, you will get a parity check. Unraid records the stop/start status of the array on flash, so it is also possible this has been caused by some problem that prevented Unraid writing the status to flash.
So, did you reboot/shutdown from the webUI, or did you just use the reset/power switch?