Carcinogenesis NamedIndividual having True and False for the same property

[Demirrr]

Is it even possible ?!

    <owl:NamedIndividual rdf:about="http://dl-learner.org/carcinogenesis#d135">
        <cytogen_ca rdf:datatype="http://www.w3.org/2001/XMLSchema#boolean">false</cytogen_ca>
        <cytogen_ca rdf:datatype="http://www.w3.org/2001/XMLSchema#boolean">true</cytogen_ca>
    </owl:NamedIndividual>

[alkidbaci]

I think technically this is possible but semantically it doesn't make sense. I noticed that this individual is the only one that has this property assigned twice. Its probably a mistake.

[Demirrr]

Exactly