Confirmed. Asustor has an issue with the Reds. Ran the Reds in a Synology for a while, and then in my Sever 2012R2 box running StableBit Scanner. I left Scanner to check the drives almost constantly, and it found nothing. Stuck the Reds back in the Asustor and within an hour it was reporting bad sectors again.
Asustor needs to address their SMART reporting - it's wrong, plain and simple. I've confirmed it's misreporting the WD50EFRX and it's also misreporting Seagate ST4000DM000 drives as faulty when they aren't.