I had this problem for years and in more than one house and with several speakers. I had assumed I had a hearing problem in my right ear (image shifted left). Long story short - it was because of the speaker placements interaction with the rooms acoustic's and the placement of the listening position. I moved my listening chair and speakers into a nearfield listening arrangement - speakers are 8' apart (center to center) and listening position is 9' from speakers.
Don't rule out the possibility that your set up could be the cause.
Don't rule out the possibility that your set up could be the cause.