Delete the property. Then Create it again from scratch. Make sure to select "Decimal" as the Data Type. When creating the Prompt List anew make sure to add the zero (0) before the decimal values "0.333".
I have just tried again, but now what I did was to create those properties as decimal and after as double but both did not work. The message a got was 'The value 667 for property TechnicalSkillRating is not defined in the prompt list', but when I show the property details it appears '0.667' in its prompt list.