I'm stuck with this problem and i don't know how to fix it
How to solve this problem? I don't know how to describe it, but this problem is too confusing for modeling. I am only beginner for this and this problem is too difficult for me.
This is most likely a problem with the operator settings you have, specifically the interpolation setting. Try changing it to Blend Surface. Below are some images to show the difference. This image shows an object similar to yours and has the same unchanged operator settings
Second image shows the same object with but with interpolation changed to blend surface.