Why are there these reflections? I have a GTX 1080 Ti and I'm using Lumen.

hgf

GTX 1080Ti Lumen

What are they meant to look like? Without context that information isn’t very actionable.

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Look like normal. No Artefact. What Context?

So, without parallax or like a path-traced render I can’t tell what they’re supposed to look like. Lumen software reflections tend to look blocky or blobby like that, and without a comparison with a ground truth render like a path tracer, I can’t tell how wrong it is. There’s a possibility they’re just like that if you can’t use HWRT.

I use Photoshop. I want reflections, not artifacts.

You use photoshop in the sense of you’re demonstrating what you want, or you’re just going to fix it in post?

You could just use a planar reflection on the mirror.

I pasted a photo of the bedroom into Photoshop because in Twinmotion the reflection is as in the first comment.

Can you post other views of the scene, or a video of you moving through the space?

Why? There is still no reflection, just like in the first post.

It doesn’t look like no reflection, it looks like you’re seeing a strange series of artifacts, and I can’t tell you what kinds of artifacts those are without more information. How to fix them depends on what sort they are.

Add a reflection probe