Number-field format not the same between PRD preview and execution on user console

Hi ! :)

Like it wrights in the title, I set a format to my number-field in PRD 3.7. When I run the preview in PRD, format is ok.
But when I publish the report on the user console (3.7) and I execute it, the format of my number is not the same as the preview.

Any idea ? Can it be environnement variables (LANG ? etc...) ? Or a parameter embeded in PDF report ?

Thanks in advance