Why do I have such little internal memory left?

[AC Question]

I got a notification on my phone telling me that I needed to make more space on my internal memory, so I uninstalled and disabled some apps.

Now I have 12.53GB / 16.00GB being used, but the numbers of each category don't add up:
Apps: 1.5GB
Tips & Help: 6.27MB
Browser: 44.22MB
Gallery: 527MB
Miscellaneous: 1.2GB

Which means I have loads of my internal data being used. Is it the OS? I have a HTC One M8 with stock Lollipop 5.0.1

 

[SnowSanta]

Could be bloatware. But it seems to be a hell of a lot

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