Hi Jana!
Hmm, I guess something is done wrong. Try to remove both form and sheet and start over. You’ll need to:
1. Copy the sheet by clicking this link https://goo.gl/qe9xyj
2. Do nothing, just close sheet and go to the Google Drive, find “Copy of Life…” form file.
3. Open it, there would be “edit form” state of the Google Form, do nothing there yet.
4. Now click on the eye icon on the right top (near the “send” button), the same form would open for filling out.
5. Fill the form.
6. Open the sheet, results should be there.
Please let me know if it worked. I created a new test Google Account and everything is working well.