Pitch information is stored in full cents only, no precision. The fractions of the cents are “forgotten” by Wavelab when the file is saved. Even if the precise pitch information was present in the wave file before processing in Wavelab, it is rounded to full cents after processing.
The same issue I reported already here:
But I am sorry to say that no improvement in Wavelab 10 was acomplished. I hope for then next update.