When you choose Polar from the Plot 2D submenu, the view that appears is determined by the inequality - π≤θ≤π on the angle. The view intervals are chosen by the underlying computational system and depend on the shape of the function plot. The following are default views.
Changing the view for the latter graph to -5 < x < 5 and 0 < y < 25 gives the following view of the same plot.
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