What is Silverlight 5.1.31211.0 and how did it get on my computer?

I've checked sllauncher.exe, the registry, various update checker programs, the official Silverlight download page, and the official version history, and they all confirm the following:
[1] The latest version of Silverlight is 5.1.30514.0.
[2] The version of Silverlight on my computer is 5.1.31211.0.
I've been unable to find any official reference to the version I'm apparently running. Should I downgrade, as recommended by the official download page?
I'm running Windows 8.1 64 bit.

Hi,
You could try to download silverlight from below:
http://www.microsoft.com/getsilverlight/get-started/install/default.aspx?reason=unsupportedplatform
Besides, you could refer to silverlight history release:
http://www.microsoft.com/getsilverlight/locale/en-us/html/Microsoft%20Silverlight%20Release%20History.htm
Best Regards,
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