Can't mount exFat partition (incorrectly recognized as APFS?)

[/RaspberryPi]

Hi.
I'm running Raspbian on an 8gb using an external ssd to boot (SATA to usb)
I have a separate 4 GB external hard drive that I've partitioned into 3 separate partitions: ExFAT, macos Journaled, and APFS.
When I plug the drive in, it immediately recognizes the journaled, but can't recognize the other two. I'll share both what it looks like in GUI and via ssh.
GUI:
The APFS one reads:
- "Error mounting /dev/sdb2 at /media/pi/32296e9a-fce5-462f-9f31-d166687ecfba: unknown filesystem type apfs" The random string isn't actually the name of the file, but I assume that's just an issue reading the drive name
The bigger problem is that the other drive (ExFAT) also reads the exact same message (different name). It's not APFS, but my pi seems to think it is.
SSH:
` sudo fdisk -l` produces:
GPT PMBR size mismatch (4294967294 != 7814035455) will be corrected by write.
Disk /dev/sdb: 3.7 TiB, 4000786153472 bytes, 7814035456 sectors
Disk model: My Book 25EE
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: A544F8AC-DA68-4BFD-8842-4054BE84BF73
Device Start End Sectors Size Type
/dev/sdb1 40 409639 409600 200M EFI System
/dev/sdb2 411648 1953536647 1953125000 931.3G unknown
/dev/sdb3 1953536648 5858812983 3905276336 1.8T unknown
/dev/sdb4 5858812984 7813773271 1954960288 932.2G Apple HFS/HFS+
So I know that the 1.8 TB is for sure my ExFAT. I've already installed `exfat-fuse` and `exfat-utils`
However, when I try to mount it with `sudo ntfsfix /dev/sdb3`
I get
Mounting volume... NTFS signature is missing.
FAILED
Attempting to correct errors... NTFS signature is missing.
FAILED
Failed to startup volume: Invalid argument
NTFS signature is missing.
Trying the alternate boot sector
Unrecoverable error
Volume is corrupt. You should run chkdsk.
My disk isn't corrupt. Any idea what's going on?

submitted by /u/tnw-mattdamon
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