4 hd in my MacBook Pro
You have only one SSD in your MacBook Pro. The main former CoreStorage/HFS+ volume and the Recovery HD were transformed/merged to an APFS container while upgrading to macOS 10.13 (High Sierra) though.

Here is the old partition scheme:

diskutil list
/dev/disk0:
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                       *120.5 GB    disk0
   1:                        EFI EFI                    209.7 MB    disk0s1
   2:                  Apple_HFS Macintosh HD           119.4 GB    disk0s2
   3:                 Apple_Boot Recovery HD            650.0 MB    disk0s3


After converting it to APFS disk0s2 and disk0s3 are merged to disk0s2 as one physical volume (container). The container is split into various volume disks.
A boot disk APFS container usually provides four volumes with different roles:


Preboot (which has no predecessor)
a non specific one/multi-purpose (the former system volume)
Recovery (the former Recovery HD)
VM (which has no predecessor)


Only one (the former system volume) is visible in the Finder!

The sizes of the volumes can be adjusted dynamically by the system without user interaction.

diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                       *120.5 GB    disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                 Apple_APFS Container disk1        120.3 GB    disk0s2

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                     +120.3 GB    disk1
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD            13.7 GB    disk1s1
   2:                APFS Volume Preboot                 19.9 MB    disk1s2
   3:                APFS Volume Recovery                519.9 MB   disk1s3
   4:                APFS Volume VM                      20.5 KB    disk1s4




The app you are using probably shows the possible max size of each APFS volume disk and not the real allocated size. It's either not properly adapted to the new file system or it's on purpose.

To get the real sizes enter diskutil list or diskutil ap list in Terminal.app. To get more APFS sub-commands enter man diskutil.