Is it possible that the foot rail of the bed blocks a portion of the TV screen? Try laying on the bed with a couple of pillows under your head and see for yourself.
Not that this would work for everyone, but here’s how I solved the shared wall problem with our listing. I also have an attached guest suite space where our living room wall (where the TV is) shares the guest’s wall where their bed is. We have a nice sound system on the TV with excellent base tones. Although I have good hearing, I like the TV on loud. However, out of respect for the guest trying to sleep, I used to forego evening television when we had guests. I got resentful of that after a while. To solve the problem, so I could listen to loud TV and so the guest wouldn’t hear it, here’s what I did:
The TV has a Roku on it so I put the Roku app on my smart phone, put a “Y” on my cell phone headphone jack, put the Roku app on “headphone mode” then put headphones on each “Y”. My husband and I watch loud TV now thru headphones and the guests don’t hear a thing. It’s working well for us, cost little to implement, and guests generally comment in reviews how quiet the space is.