I have all my boxes forward mail to my Laptop from each unix box.
The only configuration that I have is one ".forward" file in ROOT's home directory of each box with my email address to my laptop account.
You may have a few problems 1) your .forward is in the wrong directory. 2) your file contains extra spaces or unprintable chars in the file. 3) Your net connection from your boxes to your network where your laptop resides are not connected.
I would suggest recreating each .forward file from scratch on each host in the proper directory for the user that you want the mail forwarded for.
Double check your work just to be sure. It is probably something simple that you have overlooked.