Syndicated posts don?′t show up in their categories

I recieve syndicates RSS posts from Google News search and place them in different sub-categories (page: https://www.sejer-iversen.dk). For some reason however only af few of the RSS feeds actually show in their categories, while most of them only show up in the top category. This means that most of the subcategories say: “Sorry, but you are looking for something that isn’t here.” when you click on them. I have tried several times to click them on the right checkboxes (Links->Syndicated->Edit) but only 2 out of 6 categories contain content. Please help, I have spent days on this problem…thanks