File convertion Nuendo vs Wavelab

I have to convert some files from 48000 to 44100.
If I convert a file in the Nuendo pool from 48 to 44.1 and back to 48 it cancel out (reverse phase) with the original.
If I do the same thing with Wavelab using Crystal re-sampler they don’t cancel out at all!

Is there anybody with some experience with both software that can help me out here?
Which one is the most appropriate to use for file conversion?