Macbook air "Aboout This Mac" storage indicator incorrect

I'm using a Macbook air 13'' thats running on OSX Yosemite 10.10.1. There seems to be a problem with the storage indicator. I click on the apple logo on the top left and go to storage to check the remaining space and the numbers don't seem to be right. The image below is what i get.
The amount of space Apps takes up is higher then all my apps added up and the space free difference to the total space is incorrect. After adding the amount of space the system says I take up from the number of the picture above its about 196GB so it just does not match the 185.16GB free of 249.77GB. Also I go in to my application folder and Highlight all the apps and folders and the system says i only have 14GB of files. I look into Disk Utility and it says I've only used 64GB
I was wondering if anyone can explain what the problem is. Is it that my Macbook Air is actually low on space or is it reading my files wrong? And what can i do to fix the problem. Thanks in advance!

1. Re-index Macintosh HD.
   Spotlight reindexing will take a while to finish.
   System Preferences > Spotlight > Privacy
   http://support.apple.com/kb/ht2409
   You will see a new category “Other” in the Storage Display.
      About “Other”:
   http://support.apple.com/en-us/HT202867
2. Try OmniDiskSweeper. This will give the storage size details of the items.
       https://www.omnigroup.com/more
   Select Macintosh HD and click “Sweep Selected Drive” at the bottom.
   Delete the files yo don’t want to keep.
   Be careful. Delete only the files that can be safely deleted.
3. Discrepancy in calculating space between Finder and Disk Utility
    “Finder does not take into account the Backups/ local snapshots,
    but disk utility includes them.”
    http://pondini.org/TM/30.html

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About This Mac Storage shows wrong size

Hello, the story so far
Actions:
- MBA early 2014 (128GB) maverick updated to yosemite in November 2014
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Many thanks of your understanding and support.
Cheers, puzzled_me

Kappy, may thanks. No difference, Get Info for the folders returns same data size as About This Mac > Storage
On a different note I have noticed that there are two Library folders under harddrive. See screenshot attached.
System/Library (6.8GB) folder contains subfolders that are also contained under Library (2.7GB) folder.
Could that be the problem?? Is that normal to have two Library folders??
Thank you for your help.

Macbook air "Aboout This Mac" storage indicator incorrect

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