|Are you testing this with a laptop? Are you sure you are connected to it? Move closer to the extender you think you are only getting one bar on. Shut off the extender. Are you still connected with one bar? If so, then tell your computer to disconnect. Plug the extender back in, let it power up, then tell your computer to reconnect and see how many bars you have.|
You might also shut off the other extender to see if you are connecting to it or your wireless router directly.
If these are easily moved, you could swap them around to see if you get the same results for different range extenders at the same locations.
The signal strength may be adjustable, check the manual.
Also, What kind of obstructions are there in one direction that are not in the other? Are you installing these on different stories of your house or is this a rambler.
And, are there any movable obstructions? I tried installing a range extender in my house. It was unpredictable. Seemed like my PC would loose connection more often with the extender than without. I think the PC would switch over from the router to the extender whenever it saw a better signal if small things got placed/removed around the router, people or pets moved around, or doors opened/closed. Better to lay in wire if you can.