Just to add, the APPLE SSD SD0128F Media is what used to be the SSD part of your Fusion drive. I can only speculate that your Fusion drive was not fused at the time of the High Sierra install and the installer only saw the SSD and converted it. Just guessing.
Apple Event: May 7th at 7 am PT
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No idea what could have happened but your Fusion drive is not fused. Perhaps that is why. Can only speculate as to what happened.
Any idea how I could go back to have a fusion drive? Thank you Fabio
You can find the directions I used to create the Fusion Drive in my 2010 Mac Pro in the link below.
Fusion drive with APFS