Ford expedition rear door

Hello everyone, I have an issue with my 2007 Ford Expedition EL Limited. When I open the rear door, it opens normally but then slams shut with great force. However, if I open it again and hold it (as shown in the video), it doesn’t slam but instead slowly lowers and doesn’t stay in place—I have to keep holding it.

Even though I replaced the struts, everything seems fine. What’s the solution?