I can't add a graph to the series

Every year when I have to add an new year series I am having to face the same problem. Somehow I have solved this last year, but now... No. The serries I want won't appear. The funny thing is that every new year is a copy - update of the previous one. Also the questions list on the right when I try to add series, is flickering (moving left right constantly).

Hi everybody, I "solved" this by:

  1. Adding an extra filter to each question and setting the same value for them. A date filter in my case: I chose the last 7 days.
  2. Successfully adding one graph over the other.
  3. Editing each question and removing the filters.