eunjoo Could you also show us some screenshots of the material settings? I want to make sure you have the right shaders and settings.

eunjoo Thank you for sharing the screenshots! The component and material settings appear to be correct, so I guess that the Render Pipeline assets set up in your project are incorrect.

For example, if I were to display skeletons using the Universal Render Pipeline/2D/Spine/Sprite shader with a Render Pipeline asset for 3D renderer, it would look like this:

If the Render Pipeline asset for 2D renderer is set up correctly, it should look something like this:

You say it will be correct in game view, so it could be that some assets are set correctly for some quality levels in the Quality settings in the Project Settings, but other levels are set incorrectly.
Could you please confirm that the correct Render Pipeline assets are being used?

eunjoo I am sorry to hear that the problem still persists. Could you please send us via email a minimal Unity project that can reproduce the problem?: contact@esotericsoftware.com
Please include the URL of this forum thread in the email so we know the context. Then we can take a look at what's wrong.

eunjoo Thanks for sending the Unity package! It turns out that the problem still seems to be caused by a misconfigured render pipeline.

Here is the image when I use the Example 2D URP Asset that comes with the URP extension package, which is for URP 2D Renderer:

Here is the image when I use the Example URP Asset that comes with the URP extension package, which is for URP 3D Forward Renderer:

Please check and look at our examples carefully. Just in case you need to know how to import the examples, select Spine Universal RP Shaders in the Package Manager, expand the "Samples" column and click the Import button (In the screenshot below, it's changed to Reimport, but if you haven't imported it yet, it should be Import.):