The font metrics like WinAscent, WinDescent, CapsHeight, x-height are calculated values and depend on the glyphs. I will give you one guess what the x-height is calculated from. 
See the illustration in the FAQ Thread.
If you design glyphs that overlap the WinAscent/WinDescent they will be clipped in most applications. Recalculate the metrics from the Font Properties dialogue to move the WinAscent to the top of the highest Y extent in any glyph, and to move the WinDescent to the bottom of the lowest Y extent.
The CapsHeight is calculated from the Uppercase H, the TypoAscender from lowercase d, and Typodescender from lowercase p.
