i had that problem too once during development but for me it was fixed by putting my quest 3 to sleep and wake it up again. Apparently it had some tracking problems that time. Please try that and tell me if it worked :)
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One random suggestion for WebXR: using the "local-floor" reference space rather than the "bounded-floor" reference space, means the game will start centered on the user, and you can hold the Meta button to recenter. It's basically like the difference between "Stage" and "Local Floor" in OpenXR. If you're using XR Tools, you'll need to hack the addon to make this change