When you added your sources, you probably didn't pay much attention to the order in which you added them. However, if you've switched to manual ranking , your source priority matters! Content that appears on papers is prioritized by content source using the following logic:
First Priority Source
We will always attempt to fill the Featured Article of the Day and the Headline Articles with content fetched from your first source.
In addition, we will attempt to fill any open 'position' with articles fetched from the first source, discarding any articles that don't match the filters you entered or the Paper Sections you have chosen to include.
Remaining content sources
If there is not enough content from the first source to populate open article positions, we will move to your second position source for stories. And so on, until all of your articles have been placed.
Re-prioritizing your sources
If there's a source towards the top of your list that is dominating your paper because of the large amount of content shared, try moving the source down your prioritized list of sources and moving more "niche" sources with less content to the top. Getting just the right mix and variety of content may take some experimenting.
To re-prioritize a source, move your mouse over the icon to the left of the source, and click and drag the source up/down to a new position.
If you feel you're not getting a good mix of content from your chosen sources, you can switch to automatic ranking which ranks your content automatically based on engagement data.
Change to manual ranking
To change to manual ranking, go to your Paper Settings > Content tab > Filters & Options. Scroll down to the bottom, past your source list and click the toggle to ON for "Manually rank your sources."