I have a few suggestions that you can look into to figure out the reason for the issue:
-
Check the resolution of the textures used in the blend material. Make sure that the textures used in the blend material have a high enough resolution to maintain quality when blended.
-
Check the tiling settings of the textures used in the blend material. Make sure that the textures are tiled correctly to maintain quality when blended.
-
Check the UVs of the meshes that the blend material is applied to. Make sure that the meshes have good UVs, to maintain quality when blended.
-
Check the settings of the Quixel Bridge. Make sure that the Quixel Bridge is configured correctly to export materials of the appropriate quality.
-
Check the settings of the blend material. Make sure that the blend material is set up correctly and that the settings are appropriate for the textures being used.
-
Check the material quality settings in the Unreal Engine project settings. Go to Project Settings → Engine → Rendering and check that the “Material Quality” settings are set to the appropriate level for your needs.
-
You can try to increase the quality of the materials by increasing the texture resolution of the source materials, or by adding more details to the source materials.
-
Make sure that the materials being blended are compatible with each other and that they are not
Please, let me know if any of the following solved your issue. Also consider letting me know what solved the issue for you! 