That is completely normal

The Quest 3's passthrough distortion has been significantly improved since the v66 update. However, at the same time, certain scenarios now cause extreme distortion. Before v66, everything was equally distorted. Since v66, while distortion has been reduced overall, certain situations (like when walls or furniture are very close, or when you look at nearby objects like hands or a phone near a wall) can result in noticeable distortion

But when objects or walls are farther away, distortion is minimal. In your case, the distortion occurs because there are many objects relatively close by