Why is there a light circle in the middle of my level

Why is there a light circle in the middle of my level? I have only one light source, a directional light which is stationary. Aside from the static meshes you are seeing in the picture there are not any other static meshes or objects that could be causing a shadow/reflection

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This is sphere reflection capture - check in editor it radius, you will see this is exactly in this place and with it’s radius. I’m just guessing on what I see, but I’m sure 99,9%

For fast fix, place one sphere reflection capture with radius covering whole your level, then place additional sphere for better visual effects, but this need some knowledge how they works.

Worth to read:

also you have whole project Reflections from Epic. You can find it under Learn tab

Thanks. I increased the reflection capture influence radius and it went away.