BA II Financial Plus Calculator professional is giving me the wrong standard deviation

So I bought the professional version for the exam mostly because it felt of better quality and materials, but now I am questing that decision, I have no idea why the 1-V function is not working as expected it always gives me a wrong Sx and Ox but the rest of the data is correct. I downloaded an app on my phone with the original BA II and it gives the correct values. So I guess the professional version needs additional input but I can't find information online, has someone else experienced this problem? how do I solve it?