G7es XI acoustic torpedo always turns back
 

I encountered a weird problem. Every time I fired a G7es XI acoustic torpedo, it runs straight for about 400 meters and then would turn 180 degrees back. I used the wolves of steel mods and nothing else. Does anyone know why this is happening?

Update: I also tried other types of acoustic torpedoes such as G7es TV and the same problem persists. I am sure that I have turned the engines off before launching. Also, I checked that this problem does not exist in the vanilla game. So maybe it is because I did something wrong using wolves of steel mod or it is a bug of this mod.