What is this shadow trail behind my character with dynamic lighting in Unreal Engine 5?

Thanks for pointing out the issue with Lumen’s temporal filter. I understand it’s causing the shadow trail, but I’m having trouble finding more details on adjusting it. Any suggestions on tweaking this or potential oversights with my flashlight setup would be great.

Also, thanks for the bonus tip about small emissive materials. Regarding the ‘noise’ you mentioned, can you point out where exactly it is and how do you think it can be avoided?