Also, if you've been bitten by added entries to complexity you'll recall that their ID are numeric strings.  Even when sorting those they don't order correctly (unless converted to integer values).

                <enumeration attributeTypeId="complexity" name="complexity">
                    <literal default="true" id="0" name="0 pts"/>
                    <literal id="1" name="1 pt"/>
                    <literal id="2" name="2 pts"/>
                    <literal id="3" name="3 pts"/>
                    <literal id="5" name="5 pts"/>
                    <literal id="8" name="8 pts"/>
                    <literal id="13" name="13 pts"/>
                    <literal id="20" name="20 pts"/>
                    <literal id="40" name="40 pts"/>
                    <literal id="100" name="100 pts"/>
                </enumeration>

sort alphabetically is: 

0
1
100
13
2
20
3
40
5
8