Noise with SineSynth tutorial on one system not others

We are using ProJUCEr in a Computer Science Special Studies course “C++ for Music Frameworks” and like it a lot.

However, a strange behavior has occurred. On one student Windows 10 system the SineSynth Tutorial produces a crackling noise when the output channel is set to 1 but the noise is replaced by the normal sine wave sound when the output channels are set to 2. This behavior has not been observed on other student systems.

Does anyone have an explanation?