Layers are bleeding together on export/stamps appear which are not there

Hello,

sorry for the lengthy title but I didn’t find a shorter description for this problem.

I encountered strange behavior when exporting in 4K and higher resolutions.

When I export in 2K, the map is exported correctly (see attachments m1_2k.jpg/webp and m2_2k.jpg/webp).

When I select a higher resolution, on some maps the layers seem to bleed into each other or some stamps appear which actually are not there (see attachments m1_4k.jpg/webp and m2_4k.jpg/webp).

On the m2_4K maps, I outlined the anomaly with a red rectangle so it easier to see.

Here are some details on my working/test environment:

OS: Ubuntu 24.04.4 LTS (x86_64; GNOME) and Windows 11

Browser: The m1 images were exported using Opera (V133.0.5932.34), the m2 images with Brave (v1.92.139)

Graphics Card: Radeon RX 7700 XT / 7800 XT

CPU: AMD Ryzen 9 7900X3D 12-Core Processor