Why is Xamarin Studio Changing the .sln File format version #?

When checking in my latest solution file, I'm noticing the Xamarin somehow changed the VS .sln file format info in the .sln file. I don't know how this happened. Someone, please explain to me, how it happened and how to prevent this? I have fully licensed VS 2013 Pro version. Thanks.

Attached is the screenshot of it.

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