The Garmin Connect Web view for an activity no longer shows the chart for an IQ data field correctly - any negative values are not plotted and are missing from the chart. This is a new bug: it used to work correctly up to a week or so ago. It still works correctly in Garmin Connect Android App.
This is reported to me by a user, and I have confirmed it my self. See also: https://forums.garmin.com/apps-software/mobile-apps-web/f/garmin-connect-web/440640/garmin-connect-web-not-showing-negative-values-for-iq-data-chart