Macintosh HD - ISSUES - UNMOUNTED, SNAPSHOT, CAPACITY LIES!

Hello. Needing some assistance.

I have a late '13 rMBP15. I allocated 40gb to Bootcamp not realizing a chunk would basically disappear. Now, I need more space on that partition.

Trying to go this route: create partition on Mac HD, then go to Bootcamp windows and reclaim it.

Few things are causing me a headache:

1. About's STORAGE tab says I have 226gb available. DISK UTILITY says 162gb available.
   1. I've deleted trash and unlinked OneDrive freeing up close to 70gb which might be the discrepancy. But why is it not showing in DISK UTILITY?
2. DISK UTILITY shows my main Macintosh HD unmounted. Never seen this before. Also there's a snapshot file and a "Macintosh HD - Data" folder that I don't remember seeing before.
   1. When I tried Recovery Mode to Mount the Macintosh HD, it mounts but when I boot into MacOS it's unmounted again and I can't mount it while in MacOS
3. When I try to partition, it says "Minimum size of CONTAINER" needs to be 459gb (basically the remaining balance of the HD without the BOOTCAMP PARTITION) - but supposedly I have 162gb or 226gb available.
4. Also never noticed before there are 5 volumes shared in the 459gb... don't remember that before..

Again, trying to increase size of Bootcamp Partition; 20gb or so should do it.

I've backed up to Time Machine yesterday -- although, when unmounting my 8TB external yesterday, I ejected but seemed I pulled the USB from the laptop a bit before it was complete and I got a notification saying "no ejected properly" even though I waited 5-10 seconds. Could this have created a corrupt snapshot or something?

I tried restoring from Time Machine in Recovery Mode but it said I need to reinstall MacOS then use some sort of (restore) Assistant or something.

Appreciate any help.

Thanks.