Holes appearing when render resolution is a lot bigger than training resolution

[ultra-sonic]

Hi there,

I was rendering the garden scene using the SIBR viewer set to 3840x2160 output resolution and the brick wall in the back of camera position 1 started to "fall apart"

Do I need to train 3d Gaussian splats on the desired output resolution? I'm starting to see holes when increasing the render resolution beyond the resolution I have trained on.

Is there a simple explanation for this issue? I can't get my head around this right now.

Thanks in advance Oliver