All my items are viewable on my main Shop page

Hello,

For some reason every one of my items is showing on my main online shop page.

Via the edit functions there doesn't seem to be any way to remove all these hordes of items from the front page of my shop. I've checked some of the items in question, and they are not 'featured' (under 'visibility')...

I'd like to just display the best sellers from each category on the first page of my shop. How do I do this?

Thanks, from Morgan