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Drawing more than 2 graphs in a window

I am trying to do an animation of several graphs in one window. When I try to add more than 2 GraphWidgets in a window, only the first 2 can be rendered, and the others just show a black rectangle. However, the simulation seems to be fine, because the plots seem to be normal. Is this a bug of the library or there's something wrong in my code? myTest.py