The "1680x1050 ONLY!" text refers to the screen resolution at which you run WoW. Vexione's UI is only designed to work with the screen resolution of 1680x1050, which is a widescreen monitor.
The screenshot you uploaded is in a resolution of 1024x768, which is a normal monitor - this means that your screen doesn't support the resolution that Vexione's UI was designed for.
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