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Windows Storage Space Incorrect Pool Size

Storage Space Configuration Image

I have a Storage Pool here with a 10.9 TB capacity [image above]. I have 3 spaces in the pool, with a combined capacity of less than the total pool capacity, yet I am being warned to add 2 more drives despite only using ~75% of each 5.45 TB drive in the pool.

  1. D = 2TB mirrored = 4TB
  2. X = 5TB split between each drive = 5TB
  3. M = 1.5TB split between each drive = 1.5TB

Combined, this is 10.5 TB out of 10.9 TB. The storage space is only using 8.13 TB out of 10.9 TB.

How can this be explained? Is it a misconfiguration issue?