Beetle PSX "Dualshock" input option slowdown the games

Hi, i have a strange issue with the core, when i use the “Dualshock” profile in the input options, the game start to slowdown with crackling sound, if i go back to “Playstation controller” the game returns at full speed This happens only with NTSC games, PAL games runs allways at full speed Someone knows the reason why this happens ?