jQuery uses SourceMaps, this enables you debug minimized code.
When you open the console and the setting General > Source : Enable JS source maps
is enabled, then chrome checks for the SourceMap, and out of the sourcemap creates maps to the original version.
This is why you see both version.
You see both files, because a minimized file could contain multiple files, which when source map is enabled will be displayed as individual ones.
EDIT
The files referenced by the source map are not immediately loaded so they don't appear in the network tab. Only if the content is displayed while debugging they will be loaded and only at that time you will see them in the network tab.