Entire year not showing in files when viewing by date

I've only just noticed this, but when I go to 'all my files' or 'documents' etc and view by date created (something I've always preferred to do) It seems that 2015 is completely missing. I uploaded a ton of things last year and if i manually search for them, or go directly to the file they are there straight away. Its just any folder jumps completely from 2014 to last 30 days.

Does anyone know whats going on here?