[=;201409]
Its probeboly due to the local viewport is smaller then the desktop reselution.
If you run in full screen / Imersive Mode am prety sure it be in the midle for you as well.
Get Viewport Size Gets the Absolute size and may be the desktop as i understand it.
Meaning if you are working in the editor and its viewport is smaller then your reselution it will not be correct.(Workaround Imersive Mode Hotkey: F11)
This should not be a issue if you are running Standalone build.
Hope this helps.
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Well its good but the only problem is I have to right click to move the cam so Its like the normal mouse movement. Any tips for that?