Bugs on reflections and lights

As you can see, there is a weird white spec in the middle of the reflection, as well as two shadow that shouldn’t exist.
Also, the reflection of the lamps is a simple dot instead of the capsule that it’s set to, and the reflection is of very poor quality regardless of the quality at which I play or set the minimum lightmap resolution.

This is the side of a dug-out cube with sharp edges, and there is a reflection plane on each side. The material is reflective, with 0.3 metallic, 0.1 roughness and 0.1 specular.
The spec appears to be the outline of a light that shouldn’t be visible.

Is there a way to fix this ?