DL-Query for range value does not result as expected

Question

I'm new in Protege (Protege 5.2.0). I put some data properties to a class as in the picture below: Let's focus on the last line.

Then, I used DL-Query like this

OilPalm that hasGrowthRate some xsd:float[>=50.0]

I expected that the class will be returned, but it does not. I'm stuck in this problem.

Any help, please?