I'm not sure what you have set up differently, but when I unzip a folder, it keeps the zipped one while making a unzipped copy in the same location with the only difference in names being ".Zip" at the end, I wish you the best of luck on trying to find out why your pc is deleting the zip folder automatically and somehow getting a mess of files, for clarification I'm on windows 10 and am using the default extract feature, good luck.