Hello Stephane,
Joseph Basquin contacted us a couple of weeks ago to ask us exactly the same question for that same pitch value, so I assume you're referring to a sample set of his? He mentioned it was one of his older sample sets.
Either way, it's actually something that the sample set maker (e.g. Joseph) would need to correct within the sample set itself (and within its sample files); it isn't something that an end-user can change, I'm afraid.