View is duplicating content added by entity reference
I assume that you have a view, that shows content of type Project.
In project you have a nested reference to a Resource.
Basically you are asking views to show you all the Projects, and related to them Resources, so for every Resource that you are adding, views is showing you projects that are related to new Resource, but, since you have only one node of type Project - views showing you Project for every Resource that you added, so you have what was implied to happen.

If you want to have list of Resources on a Project page - I would suggest you to create small view blocks, using node id of a resource as a context filter to the view,  (So in this case view would be showing you list of the Resources to the given Project on each project page.)
For that you need to create another entity_reference field on a content type of Project and filter it through the view that you created.

If this is what you were looking for. It was hard to understand you tbh