unzip myfile.zip extracts files in the working directory by keeping path names from the zip file.
So if you get a subdirectory myfile it means it is part of the relative path of compressed files. Check it by listing the zip content
unzip -l myfile.zip
So you can unzip the file from the directory above, or, from the target directory unzip with -d option, where -d is the directory above
cd myfile
unzip myfile.zip -d ..