Why you pack two different category mods in the same page? You know you put "Gwent" category and a Gwent thumbnail, so everyone expect to see Gwent mod. Not with a "Weapon" mod for Crossbow that looks like it's an out of subject. That one is easily missable because your mod page is "Gwent" category mod. You should publish it in different mod page.
The mod author packaged it wrong. It would have to have a folder before "content". If you create a "modGwentCards" folder inside the game's mods folder and extract it into it, it will work. Or repackage correctly by creating the folder with the mod name and "content" inside it, to use with ModManager.
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Armor https://www.nexusmods.com/witcher3/mods/5914
Viking Helmet https://www.nexusmods.com/witcher3/mods/3551
Not with a "Weapon" mod for Crossbow that looks like it's an out of subject. That one is easily missable because your mod page is "Gwent" category mod. You should publish it in different mod page.
Can you please separate those two mods you made into separate mod page?