sortName in custom categories in GlyphData.xml

Hi, I’m tying to sort my glyphs in a precise order in custom categories I made in the GlyphData.xml file in the Info folder. The sortName doesn’t work, am I wrong? I can’t bring some glyphs in the first place of my categories.

Please read this:
https://glyphsapp.com/tutorials/alter-the-glyph-order-in-font-view

My bad, the problem was because of empty sortnames (sortName="") conflicting with completed sortnames (sortName=“AZ” for example).