Is this a security bug in Windows 8.1?

I think I have discovered a serious security bug in Windows 8.1.
Today I was using my (non-Admin) user account and with Internet Explorer I saved a file in the default Downloads folder (under This PC). The file was saved, but when I went to that folder, the file was not there! Now, I was about to downloaded
it again, using IE, same as before, when I noticed in the Save dialog box that the file had indeed been downloaded, and that it was there, in the Downloads folder under This PC. Frustrated, I went to that very folder, but the file was nowhere
to be found. I was really puzzled.
Then, by chance, while logged in another account (namely the Admin account), I happened to go to the Downloads folder, and there was the file that I had downloaded using the other account.
Obviously, what I described above represents a security problem: firstly because my private files may get saved by mistake into another person's account without me even realizing it, and secondly because I was able to access another person account
(i.e. the Admin account) via the IE's Save dialog box, seeing the list of the files there, and possibly even accessing them (I have not tried the latter, though).
Has anyone experienced anything like the situation I described?
I must also say that I later tried to replicate this abnormal behavior, but for some unknown reason I couldn't. Anyway, I am sure that what I described above is an accurate account of how things went.

Hi,
Since I cannot repro your issue on my own computer, it cannot be a bug.
I suggest we try to use another user account to see if there is the same issue happened.
Please make sure your location of download folder is right:
Right click Downloads folder, and choose Properties.
Make sure the location is right under your user profile.
If not, please click Location and click Restore default.
If we still fail to solve you issue, please run Process monitor at the end of the downloading process to capture the actions, and upload the save log here for further research.
You can also check if there is any weird actions at the end of downloading process.
Process Monitor v3.05
http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx
How to use, please refer to this article:
Using Process Monitor to capture system events
http://www.sophos.com/en-us/support/knowledgebase/119038.aspx
Keep post.
Kate Li
TechNet Community Support

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    AndoBurg BV
    Voorstraat 31
    3931 HB Woudenberg
    T 033 479 40 80
    F 033 479 40 89
    E [email protected]<mailto:[email protected]>
    I www.andoburg.com<http://www.andoburg.com/>
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    Verzonden: vrijdag 19 september 2014 20:10
    Aan: Peter Gerritsen
    Onderwerp:  Can't open secured documents on windows 7 domain client with mandatory profiles.
    Can't open secured documents on windows 7 domain client with mandatory profiles.
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