smoothness issue on floor

hi

this is regarding smoothness issue on floor.

whenever i increase he smoothness reflection shows clean
but when i decrease the smoothness reflection turns into white glow.
is there any solution for this

i have attached images for ref

also i have attached expected ref image which is taken from sample scene

whenever i decrease smoothness value for smooth reflection glow increases

please help



Did you bake lighting/reflection probes?

yes lights and reflection baked