phantom partitions appeared

So I have one drive in my laptop. It is partitioned for three partitions, sda1 2 and 3. sda1 was a test install of BSD. sda3 is a LUKS LVM with multiple thin-provisioned LVM volumes within. sda2 is the /boot partition, containing kernels & init ram disks for the various Linuxes within the LUKS LVM. sda1 2 and 3 are the only partitions on this drive in this laptop.

lsblk reports this:
Code:NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 1.8T 0 disk
sda1 8:1 0 32G 0 part
sda2 8:2 0 512M 0 part /fallback_boot
sda3 8:3 0 1.8T 0 part
lukssda3 253:0 0 1.8T 0 crypt
azura-star_tmeta 253:1 0 1G 0 lvm
azura-star-tpool 253:3 0 1.8T 0 lvm
azura-star 253:4 0 1.8T 1 lvm
azura-swappy 253:5 0 4G 0 lvm [SWAP]
azura-moon 253:6 0 12G 0 lvm /fallback_slash
azura-dawn 253:7 0 25G 0 lvm /dawn_slash
azura-dusk 253:8 0 30G 0 lvm /
azura-homie 253:9 0 320G 0 lvm /home
azura-sloppy 253:10 0 400G 0 lvm /hsc
azura-star_tdata 253:2 0 1.8T 0 lvm
azura-star-tpool 253:3 0 1.8T 0 lvm
azura-star 253:4 0 1.8T 1 lvm
azura-swappy 253:5 0 4G 0 lvm [SWAP]
azura-moon 253:6 0 12G 0 lvm /fallback_slash
azura-dawn 253:7 0 25G 0 lvm /dawn_slash
azura-dusk 253:8 0 30G 0 lvm /
azura-homie 253:9 0 320G 0 lvm /home
azura-sloppy 253:10 0 400G 0 lvm /hsc
sda5 8:5 0 11G 0 part
sda6 8:6 0 4G 0 part
sda7 8:7 0 11G 0 part
sda8 8:8 0 6G 0 part
sr0 11:0 1 1024M 0 romIn the above, fallback is an LFS OS whose function is to manage lilo, while dawn and dusk are two Slackware installs.

Where did sda5 through 8 come from? Is this early evidence of disk corruption?

lsblk in Slackware and LFS both show the three phantom partitions.

cfdisk shows sda1, 2 and 3 only, as is proper.

In /dev there are (imaginary?) devices for sda5 through 8. How? Why?

Thank you.