after that I have uppdate to LR CC ver 2015.4,
LR will not change the filename during the uploading of new files.
The files are RAF from Fuji X100S, Fuji X-T1 and Fuji X-Pro2.
I use Windows 7 pro, Intel i7, 16Gb intern memory
There is a known issue where the rename doesn't occur during Import if you're importing RAW+JPG and also copying to another location. See here: https://feedback.photoshop.com/photoshop_family/topics/lightroom-2015-4-file-rename-bug
Is this your situation?