Embergen VDB render in movie render queue is pixelated

Hi everyone,
I use embergen to do VDB rendering, but im facing a big issue in term of the quality output.
In embergen viewport, the quality of the simulation is great, but when i import it in Unreal, and render it in lumen, i get a pixelated simulation, that is unusable.
The simulaton consist in a animated cylinder imported in the torch preset in Embergen.
I tried to increase the voxel count and play with voxel size, but nothing happens.
I imported another preset simulation of ground smoke that you can see on the screenshot, that is working fine. (I didn’t modify the preset for this one)

I don’t know what Am i doing wrong, and i can’t find any answer anywhere…

Please i need your help!