Hi Renzo,
I believe our analysis is correct. There is a lot of JavaScript in the Tutorials folder.
Each of the 6 Tutorials contains 4 variants of jQuery and 4 variants of MicrosoftAjax.
Our analysis is weighted by activity. If the JavaScript files are not changed over time, and you continue to make edits to the C#, eventually our system will decide that this is a C# project after all. Because this is still a young project, our decision about main language is mostly determined by the absolute total lines of code, which is in fact mostly JavaScript.
If you want a more precise report, you might try removing the enlistment from the root /sharptiles directory, and instead add separate enlistments for the individual directories you are concerned with, such as the /sharptiles/SharpTiles directory. This may or may not be what you want.