I have recently been adding a new drive to my raid array.
Whilst the array was reshaping I noticed that the webgui and mdadm where not in sync.
I believe the info from mdadm more than the webgui.
It should of showed that device 4 was down but in the web gui it showed device 3 down and device 4 up.
Prob just a script typo and the field showing status might be out of sync with device status