What do you get for:
dmsetup ls cryptsetup status
I see this:
/dev/mapper/luks-ab8911f9-b3a4-4f33-8b10-7e52c7217ae9 /raid1
This suggests an encrypted device mapper device created from the raid1 device, and it's active. So that has to be closed, or wipefs before you can stop the raid and then wipe the raid, i.e. you need to tear it down in the reverse order it was created.
You can try this: DOUBLE CHECK DEVICE VALUES wipefs --backup -a /dev/md127 mdadm -S /dev/md127 wipefs --backup -a /dev/sd[cd]1
That will backup the luks signature, then wipe it, stop the array, then backup and wipe the mdadm superblock signature. That ought to fix the problem unless there's also LVM stuff going on here too.
The --backup isn't strictly necessary but will write out a file and instructions on how to restore what it wipes in case you get the command wrong and wipe the wrong device.