Lightroom: Image difference between Develop and Library module with noise reduction

In Lightroom theres is a big diffirence between the picture in develop module, when you use noisereduction, and the librarymodule. It is very clear when you take the sliders to the extreeme. The same problem appear in Camera Raw. What you see is not what you get. This problem comes with RAW format files, not with jpeg. I use ORF Olympus format. Same problem with TIFF and DNG. It is very annoying. I have had contact with technical support, but they could not realy help, since the problem is in the programs itself. Thank you.