Dependencies needed by your dependencies. Sadly some creators do not understand the package system, they are not spliting their content into multiple packages so for example a demo scene which needs all the dependencies is separate from the actual content (e.g. clothing item) which maybe doesn't have any dependendies at all.
Something that's actually in your scene, but you are not aware of it. Happens often with morphs which are not reset to zero. I recommend opening your scene JSON with Notepad++ (or similar editor) and search for the package name. Once you know what it is, you can remove it.
Dependencies needed by your dependencies. Sadly some creators do not understand the package system, they are not spliting their content into multiple packages so for example a demo scene which needs all the dependencies is separate from the actual content (e.g. clothing item) which maybe doesn't have any dependendies at all.
Something that's actually in your scene, but you are not aware of it. Happens often with morphs which are not reset to zero. I recommend opening your scene JSON with Notepad++ (or similar editor) and search for the package name. Once you know what it is, you can remove it.