WDS Driver problem

We are using WDS (on server 2012 R2) to image our pc's.

I want to integrate drivers in the Server instead of integrating them into the Image.

I've added all of the drivers to the server and created groups to distribute them.

I've also added filters to the groups so that the correct drivers are installed.

The problem is that WDS doesn't detect the Model of the computer correct and doesn't distribute the drivers.

This is the filter I'm using:  Model Equal to "E6440", "Latitude E6440", "6440"

We are using Dell laptops.