There is something wrong with, http://language-reportcard.wmflabs.org/#cx_beta_enablements-graphs-tab and eswiki graph. It seems data is also not updating after graph show flatness. See, https://es.wikipedia.org/wiki/Especial:Preferencias#mw-prefsection-betafeatures for correct figure.
On betafeature figure = 2,636
On graph = 2.09K