Internal storage issues showing space used that isnt

Basically when i use ES file explorer i have roughly 4gb of apps , system file, and other stuff but its showing an additional 14gb or so used. Is this a common problem? I didnt see anyone else ask about it and googled for an answer and found nothing. Im hoping its not damaged storage and a simple fix. Was planning on giving the new rom a spin as soon as enough folks were running it to know a baseline on fuctionality and common issues as i miss having a clean rom with root.

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