Choppy sound while recording OSSC with NTSC consoles

Hi,
I discovered a strange issue tonight : I wanted to capture some video game footage and could not get a clean sound while playing NTSC games on PS1 and PS2, while PAL games were OK. Sound was clean on my TV. I'm playing with an OSSC but considering the sound was clean on my TV I guess there's an issue with OBS or my devices (I tried with two laptops and a Surface Go, this third device had better results), or a communication problem between my OSSC and OBS ? Thank you for any tips !

Here's a log file : https://obsproject.com/logs/p7GofH1jzUcUnFbB
 
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