There's the known bug for years that the CIQ datafields are forgotten AFTER editing the layout or changing the fields. However since last week it happened to me 3 or 4 times without editing anything. I only used the start, stop button and save at the end of the activities. I was abroad so did more walks than usual and also longer activities, but still nothing special I haven't done previously.
It just happened to me a few minutes ago. I started my indoors walk activity. About 10 seconds later I looked at my watch to see how many steps I need to do today and there was some other ciq datafield.
fr965 21.19