Distance sensor logging rate is look like 1 hz in logger module. So it is normal I think. Here a distance sensor log from a fixed wing flight I logged.(tfmini S)
Time range is short because it’s rapidly goes out of range. It is look like similar with your log. But although your local position estimate for altitude is about 2 meter your distance sensor measuring different values even while vehicle at level position. I don’t have more idea what can cause this problem
but I think you should first make sure that data loss exist.