When someone sends me a donut, the sound repeats

Are you Desktop- or Output Capturing the same device that you send the Monitor to? That'll do that.
 
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Any Output Capture sources you may have, are the same as the Desktop Audio, and can cause the same problem.

Or, you could not send anything to the Monitor:
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Use the Monitor Off setting for everything there...which also means you'll get nothing from OBS in your headphones or speakers.
 
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