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Stdout updates only on mouse movement

I have a peculiar problem.
I coded a lot of print statements to monitor participant performance online based on stdout.

The setup has dual monitors, one for the participant and one for the control of the experiment.
Everything works well except of the stdout, which updates only when I move the mouse (the participants only use keyboard). The code is a mix of normal print statements and some with modified separator and end characters (e.g. tab instead of new line).

Does anyone have any idea how I could fix it?

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