How to get auto-commenting multiple lines back in Sublime Text 3?

Question

Sublime Text

Everything worked as usual, then I needed to run the js code from the sublime and I switched to the previously created Build System for JS like this:

{
  "cmd": ["node", "$file", "$file_base_name"],
  "working_dir": "${project_path:${folder}}",
  "selector": "*.js"
}

And when he returned to python code and switched Build Sysytem to python, he refused to comment on several lines, and if you just put the cursor in one place in the middle of the line and press ctrl+shift+/ it pastes this (?# ). How can I get everything back to normal?