C# - Calculation result change when uploading

Hi. I'm making a calculation in C# wich works perfectly(as expected) locally, but as soon as i upload it to my server(with CuteFTP) the result changes drastically. I've checked the uploaded files on the server and the are itendical with the local ones, so no code changes has happened as far as i know. The only thing i can tihnk of is that I use doubles from a dropdown, i.e. converting them from strings to doubles(from commas to periods), but that would be the same locally, right? So... I'm not experienced in FTP-programs and I'm not sure whether it's a coding error or not, but do you have any ideas about this? P.S. Need code examples? P.P.S. Wow, no line breaks, not cool.