I have almost the same problem, but it seems to have nothing to do with the file name. Since I upgraded my windows to 1803, my explorer behave weirdly in reading folder size.What it shows is different from the the real size of all files it contained.The difference could be so huge, for example, the folder size is read to be only 649 MB, but the actual files and folder it contained is 9,92 GB.
Windows File Explorer Not Showing Correct Folder Size If Folder Named 'Applications'
Since installing the 1803 update, Windows File Explorer doesn't display the correct folder size if the folder is named 'Applications'.
There seems to be a bug that if the folder name is 6 characters or more and starts with 'Appli', the folder size shows significantly less than it actually is. For example if the folder is named 'Apps' or 'Appli', it will display the size correctly. If however it is named 'Applications' or 'Applix' or 'Appliy', then it won't display correctly.
The Feedback app doesn't work on my computer due to having telemetry settings set to 'Basic', therefore I am reporting the bug here instead.
OS Version:
Windows 10 Pro X64 (17134.1, 1803)
Screenshots:
Windows for home | Windows 10 | Files, folders, and storage
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Anonymous
2018-05-09T09:04:58+00:00 -
Anonymous
2018-05-03T21:16:44+00:00 Please file a bug report and send me the short link so I can send it to the engineers:
Press Windows key + F
This will open the Feedback hub
Proceed to submit your report.
Feedback:
You can reach out to key folks on the Windows Engineering team through Twitter
https://twitter.com/donasarkar
https://twitter.com/brandonleblanc
https://twitter.com/northfacehiker
Make sure you send short link to them. They are known to be very responsive and might be able to point it in the right direction.
Remember to send me the short link.