In the case above, maybe there was something wrong with the process where you added your startup volume, space allocated and it is one you cannot delete so the best thing to do is delete and reformat the storage device.
The Apple File System (APFS) is known to be a tool that gives a lot of space for one to share between volumes on a disk.
Note that in the case above, the issue may be due to space allocated and also maybe there was something wrong with the process where you added your startup volume and it is one you cannot delete so the best thing to do is delete and reformat the storage device.
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