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.
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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