Rendering trouble with light reflections path tracer and lumen.

Hi!

I was rendering my scenes but the light reflections looks so bad. This problem occur mostly in path tracer - on the photo you can see, that neon lights create weird shape on the shower enclosure. The problem dissapears when I change the path tracer to lumen (photo in attachment). My rendering settings are also in attachment, i was trying to change them but the situation is the same.

Lumen is much better for me, but sometimes it also make weird shapes of light in reflections or mirror (again, it’s neon light).

How to get rid of it and what’s the cause?