My first (serious) system that I had in our previous house exhibited a similar problem, only that it was in a living room adjoining the dining room. Long and narrow space with system agains the short wall. Not long to discover that when I stepped into the dining area while system was playing, insane bass would suddenly emerge.
the dining area was separated by a ceiling archway opening that dropped into about 2ft of wall space on either side of the opening, which seemed -in a manner of speaking - to act as a bass trap. When I got fed up and just moved the system against the long wall of the living room, wallah! All the bass I needed (too much in fact). Some slight adjustments did dial things in over time.
try mining it to a long wall to start? Just for reference. Another consideration is a corner placement, which has been known to help break up potential standing waves.
Ultimately, some pretty expert advice from everyone before.
This is frustrating, but a placement change should definitely fix this!
Best of luck 🙏🏼👍🏼