EXT4 Partition Not Recognized

[PowerOfM]

I've been trying to install Manjaro using the Calamares installer and it constantly fails to recognize any partitions on one drive (/dev/sda), whether or not it has an empty 400gb ext4 partition, or just 400gb of unpartitioned space.

Calamares view: http://i.imgur.com/IQ8kBid.png
Output of lsblk: http://i.imgur.com/QuGmIPJ.png
Output of blkid: http://i.imgur.com/elwOzKb.png
Output from sudo calamares -d: http://pastebin.com/hBitV4GJ

From the output, 3 lines stand out:
13:16:54 [1]: checking if "/dev/sda5" can be resized.
13:16:54 [1]: "/dev/sda5" seems like a good path
13:16:54 [1]: Partition "/dev/sda5" CANNOT BE RESIZED FOR AUTOINSTALL.

Using GParted, I am able to resize sda5, so I am not sure what to do in this case.

Also, the output repeatedly shows:
13:16:57 [1]: WARNING: system is EFI but there's no EFI system partition, DISABLING alongside and replace features.
The EFI partition is /dev/sda2

Is this an issue with my drive configurations? (Windows 10 is installed on sdb and "half" of sda)
Side note: I was able to use the CLI installer in the Net version of Manjaro, and that allowed me to access and install on a partition in the sda drive.