Weird problem with Lumen, how to solve it?

Guys, is this an Unreal problem or some configuration of my project? Can anyone help me?

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Going off of that one photo alone (and without knowing what you’d like it to look like), it could seem like a lumen problem, lumen issues have a sort of ‘look’ from the spaciotemporal noice they use.

If you mean the warbling and bubbling alone, that’s a quality issue. You’ll want to just crank up your ray count to get it under control, not much else you can do. I have no idea what’s happening on the centre-left wall, but it appears to be undersampling interacting with the wildly varying surface direction-that sort of corrugated surface can break some of lumen’s denoising because of how the screen probes work.