Greyed Out "Free Space" in Disk Utility

Hi
I have a problem with my main Logical Volume Group / Partition. So My main Logical Volume Group (Macintosh HD) was separated into 2 partitions. I decided to delete the second one, and once the process started in Disk Utility, it crashed. Now if I look at the Logical Volume Group, it is separated in two, first one being Macintosh HD, and the second one is greyed out and is "Free Space".
Now If I look at the info of my Logical Volume Groupe, it says "Capacity 853,07 GB / Available 115 KB" when in actuality I have a 1TB fusion Drive, If I look at the Macintosh HD PARTITION, it says "Capacity 844,56GB / Available 252.99GB" which evidently doesn't add up. The "Free Space" is supposedly 267,78GB...
I tried "filling" that free space with a new partition, but when I apply the changes to the partition layout, nothing happens, and it reverts back to being greyed out and empty. (I tried both in Disk Utility, and in Disk Utility while in Recovery Mode, and I've also Repaired the volume and the partition)
How can I either force-create a partition with that free space, so that I can use all of my actual HDD space, or completely erase that "Free Space" and have my Macintosh HD partition fill the whole Logical Volume Group. (I tried erasing the free space of the Macintosh HD volume, but it didn't change anything.
Hopefully, there is a way to do it without having to back up my whole Macintosh HD partition, and reformatting my whole computer...
Thanks

If you wish to delete data, the best option would be to encrypt everything on the drive (locking everything with a password)  and then erasing the drive.   This would atleast scramble the left over data.   The problem is that SSDs have a wear controlling firmware that distribute the load accordingly, so the entire drive wears evenly.   Secure erase wouldnt work since secure erase works by first erasing the refrences to the data, and then writing 0s over the left over data.   Since the firmware distributes the load differently each time, there is no guarantee that the data would be covered in 0s.  

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