Welcome to Android Central! Some manufacturers don't implement Adoptable Storage very well. I recall seeing a number of posts about it for Moto devices talking about still having low storage despite formatting the card as Internal Storage. I suspect the duplicated folders you see are an artifact of Adoptable Storage, and a symptom of the poor implementation.
I'd back up your photos to your computer's hard drive (via USB or via uploading to your Google Drive/Google Photos in the cloud) and then reformat the card to Portable Storage. Adoptable Storage is an imperfect solution, and can put your data at risk, since SD cards are inherently less reliable by nature -- if/when they fail, you could lose a fair amount of data without warning.
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