First Sorry For My Poor English.
I Met a Problem.
In My Level,I Add Some Fire.But These Fire Cause Some Light Problem.
Look At The Wall,I Find Some Flash On It.When I Hide These Fire The Flash Disappear.
I Want to Know What’s Happend And How to Solve This Problem.
the red moving dots on the wall? those are reflections from the fire:D do they dissappear when u drag away or delete the fire?
When I Remove those fire the reflections are disappeared.but i want those fire in my level.I don’t want the reflections flash.
then go into the material from the wall which reflects and set down metallic and ad some roughness 
maybe this could be a solution
Sorry For my late reply.
My Level have many Metallic Object like Metallic Door.I can not set down the metallic value for these object or these will be unreal. Those Particles are the P_Fire in StarterContent.I have no idea why the reflections flash like this.
maybe this picture can tell you how the reflection flash.
