How to prevent the opening of new windows with figures?

Question

When I run a Python script which creates and saves a matplotlib figure, the figure is shown in a new PyCharm window (even if there is no plt.show() in my code). If I have many figures created in the script, then many windows are opened. This tends to be very buggy and I'd like to know if there is a way to prevent the opening of those windows.

EDIT: This happens when I run with Python Console. See the screenshot below.

EDIT 2: If I plt.close() the figures in the script, the windows open furtively then automatically close. This is better but it is still annoying to get all these windows that pop up.