Problems with light reflection on the mirror material (please help)

Hello everyone I’m new to Unreal Engine, but I haven’t been able to solve this problem anywhere. I decided to apply Planar Reflection to the surface of the mirror, but noticed that the mirror reflects light sources in the form of bright balls (although this does not happen in the scene). I have tried changing the light parameters and the material parameters, but I have not yet achieved anything in this. Please help me figure it out. (sorry for my english)