Noob having issues

Very first time trying to use a different operating system. This isn't my main laptop, as I upgraded to a MacBook Pro last year, and I want to use this one to mess around with some different OS. I have a 2019 MacBook Air with the following specs:

Processor - 1.6GHz Dual-Core Intel Core i5

Graphics - Intel UDH Graphics 617 1536MB

Memory - 8 GB 2133 MHz LPDDR3

I've got Pop!_OS flashed onto a drive, I can live boot from the drive and run the OS. When I go to install the OS, it shows my Apple SSD having 15.1GB of storage available, which is incorrect. According to Disk Utility I have 102GB free. Nothing I have tried has fixed this issue. As far as I can tell, the disk is healthy. I tried using GParted in the live OS and made the mistake of wiping the entire drive, which still did nothing and then I had to internet recover MacOS which took hours. Got MacOS reinstalled, checked disk again, everything looked exactly how it should, booted from the flash drive, and it's still showing 15.1GB free. I feel like breaking this MacBook in half. Anyone have any experience dealing with this or have any ideas? Thank you!