Wrong anwers

Hi! I have noticed that my Mac version of Speedcrunch gives me wrong answers. I have compared the answers with my teacher and and I have also used different calculators. I have had completely same clause but different answer.

here is one example (11,3/4,2)^1/8=0,3363... on speed crunch The same, correct answer on 1,131...

I have tried to download speed crunch again and tried to switch setting and stuff. The bug is a problem on my maths class. Can you tell me what is the problem?