Double content from collection (easy one for WF guys...)

Hi guys - one of my team editing a site I am ‘updating’ and it’s resulted in the duplication of collection driven content that I can’t seem to rectify. On the attached attempting to delete ‘Research’ also deletes ‘Doctoral Study’… same goes for the imagery. I’m utterly baffled… any ideas?

Here is my site Read-Only: [LINK][1]

Hi @jacobite

Yeah if it’s in a collection then it will. You have to show, hide, display, etc through filters in the settings of that collection.