Clojurians Log v2

Is there a limit (32 entries) on how big a hash-map can be visualized as a bar-chart/pier-chart ? From the contextual menu on the following map I can select the view:bar-chart

(->> (for [a (range 32)
          :let [k (str (char (+ 65 (mod a 26))) a)]]
      [k a])
     flatten
    (apply hash-map)
     tap>)

not possible with 33 elements

(->> (for [a (range 33)
          :let [k (str (char (+ 65 (mod a 26))) a)]]
      [k a])
     flatten
    (apply hash-map)
     tap>)