Why are there so many duplicates on my phone after using Link2SD

I have noticed that the internal storage of my tablet is filling up even though I have tried to link as many of the apps as possible to the SD card using Link2sd. I did a quick search for duplicates using Search Duplicate File(Super). What I found was that 1117 files where duplicated in both the /mnt/internal_sd/ and /mnt/external_sd directories. Any idea why this has happened, and how I can free up this space?

I have searched both paths and none of them are symbolic links to the other. These are actual duplicates of the files.

Screenshot of example below.

Attached Thumbnails

 

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