Ubuntu 19.04 showing incorrect memory in System Monitor?

As you can see below, the terminal output recognizes 32gb of RAM; however, in System Monitor (Ubuntu 19.04), only 15.6gb of memory is recognized (picture below). BIOS recognizes 32gb of RAM also.

# lshw -C memory   *-firmware                        description: BIOS        vendor: American Megatrends Inc.        physical id: 0        version: P2.50        date: 07/18/2019        size: 64KiB        capacity: 15MiB        capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification uefi   *-memory        description: System Memory        physical id: c        slot: System board or motherboard        size: 32GiB      *-bank:0           description: DIMM DDR4 Synchronous Unbuffered (Unregistered) 2133 MHz (0.5 ns)           product: CMK16GX4M2B3000C15           vendor: Unknown           physical id: 0           serial: 00000000           slot: DIMM 0           size: 8GiB           width: 64 bits           clock: 2133MHz (0.5ns)      *-bank:1           description: DIMM DDR4 Synchronous Unbuffered (Unregistered) 2133 MHz (0.5 ns)           product: CMK16GX4M2B3000C15           vendor: Unknown           physical id: 1           serial: 00000000           slot: DIMM 1           size: 8GiB           width: 64 bits           clock: 2133MHz (0.5ns)      *-bank:2           description: DIMM DDR4 Synchronous Unbuffered (Unregistered) 2133 MHz (0.5 ns)           product: CMK16GX4M2B3000C15           vendor: Unknown           physical id: 2           serial: 00000000           slot: DIMM 0           size: 8GiB           width: 64 bits           clock: 2133MHz (0.5ns)      *-bank:3           description: DIMM DDR4 Synchronous Unbuffered (Unregistered) 2133 MHz (0.5 ns)           product: CMK16GX4M2B3000C15           vendor: Unknown           physical id: 3           serial: 00000000           slot: DIMM 1           size: 8GiB           width: 64 bits           clock: 2133MHz (0.5ns)   *-cache:0        description: L1 cache        physical id: e        slot: L1 - Cache        size: 768KiB        capacity: 768KiB        clock: 1GHz (1.0ns)        capabilities: pipeline-burst internal write-back unified        configuration: level=1   *-cache:1        description: L2 cache        physical id: f        slot: L2 - Cache        size: 4MiB        capacity: 4MiB        clock: 1GHz (1.0ns)        capabilities: pipeline-burst internal write-back unified        configuration: level=2   *-cache:2        description: L3 cache        physical id: 10        slot: L3 - Cache        size: 16MiB        capacity: 16MiB        clock: 1GHz (1.0ns)        capabilities: pipeline-burst internal write-back unified        configuration: level=3 

System Monitor picture