About Particle disappearing in Low effect setting

Hi there , i got a problem about one of my particle loop vanish after changing the Engine Scalability Setting Effects to Medium or low ,
i already checked all the LOD and still don’t know how to keep my particle shown after changing the Effect ,
for now i just let the min setting of my option to be high for effect to avoid the issue .

any advice or solution will be very helpful , thanks !!

ps. when i start in engine with Simulate , it does appear at start and then stop looping , (while everything works well in High effect setting)
(so i think the reason i can’t see it after my character got there is becuz the loop was cancled?)