Debian Configuration :: Lsblk Shows Non-existent Md Partitions After Reboot

I'm getting weird behaviour while setting up an mdadm RAID1 array on debian 8.2.

After I set-up the array, lsblk shows:

Code: Select allsimon@debian-server:~$ lsblk
NAME                          MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda                             8:0    0 931.5G  0 disk
`-sda1                          8:1    0 931.5G  0 part
  `-md0                         9:0    0 931.4G  0 raid1
sdb                             8:16   0 931.5G  0 disk

[Code] ....

After a reboot, lsblk shows:

Code: Select allsimon@debian-server:~$ lsblk
NAME                          MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda                             8:0    0 931.5G  0 disk
`-sda1                          8:1    0 931.5G  0 part
  `-md0                         9:0    0 931.4G  0 raid1
    |-md0p1                   259:0    0 811.6G  0 md

[Code] ...

I don't know where the md0p1 and md0p2 partitions are coming from. My /etc/fstab and /etc/mdadm/mdadm.conf both have nothing about this in them.

parted shows one partition on md0:

Code: Select allsimon@debian-server:~$ sudo parted /dev/md0 print
Model: Linux Software RAID Array (md)
Disk /dev/md0: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: loop
Disk Flags:
Number  Start  End     Size    File system  Flags
 1      0.00B  1000GB  1000GB  ntfs

Where the md0p1 and md0p2 partitions are coming from?

I'm setting up the array by doing as follows:

Delete existing device (I've done this a few times):

Code: Select allsudo mdadm --stop /dev/md0
sudo mdadm --remove /dev/md0

Zero drives:

Code: Select allsudo dd if=/dev/zero of=/dev/sda bs=1M count=1024
sudo dd if=/dev/zero of=/dev/sdb bs=1M count=1024

Create partition tables:

Code: Select allsudo parted /dev/sda mklabel gpt
sudo parted /dev/sdb mklabel gpt

Create full-disk partitions:
Code: Select allsudo parted -a optimal /dev/sda mkpart primary '0%' '100%'
sudo parted -a optimal /dev/sdb mkpart primary '0%' '100%'

Set raid flag on partitions:

Code: Select allsudo parted /dev/sda set 1 raid on
sudo parted /dev/sdb set 1 raid on

Create RAID array:

Code: Select allsudo mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sd[ab]1

Add filesystem (I'm using NTFS, but the problem also happens with ext4)

Code: Select allsudo mkfs.ntfs -f /dev/md0