What do I do?

I literally just set up my DXP6800 Pro with 2 new 22TB WD Red Pro drives, backed up my phone which literally took days and right before I went to bed and I checked it this is the notification I get minutes after I was going through photos on it. What happened?

Some information that may be important. . . None of the hard drives are missing, I never took the two that were in it out once installed. The status page says that they are both "normal" and "not used" now. I am not using an ssd for read or write cache. Firmware is up to date.