You can use this tool
stuff.djamil.it/wtframework/
Drag the button to your bookmarks bar and click on it. It will tell you what MooTools version is running on the current page. I guarantee we are using MooTools 1.3 on Gantry admin, it might be the diagnostic is reading it wrong.
This is an example of RT template running Gantry 3.1.13.
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