Lily 2 Series, GPS is inaccurate for 1KM for running

The GPS distance on my Garmin Lily 2 Series is inaccurate for 1KM when using my iPhone 15 Pro, but the rest of the distances seem to be correct.

The difference between the recorded distance and the actual 1KM is about 400-600 meters.

I've already followed the user manual's instructions for using GPS Connected:

 * Garmin Connect is open.

 * I've verified the initial position on GPS Maps is correct.

Is there a firmware update that can fix this issue?