I have the same issue with the same cause.
Speakers do need space around them. My left speaker is in a corner and my soundstage is skewed to the right. You might try moving that couch if possible. But definitely move both speakers more not the room.
And a huge upgrade is to install Townshend Seismic Podiums under your speakers. The amazing amount of better performance they give will fill in the soundstage and offer a bigger improvement to your system than anything!