I recently unlocked the bowling ball rack and I have added it to my condo and it looks really cool, I even added 4 more balls to complete the bowling ball rack. And this is what I see:
I’ve had this bug as well, I think it may have to do with what Bowling Balls the joining player has. But it would be best for builds to have the same ball-racks between players (I do a very similar thing to what you show here).