Total activity duration shorter than race result


A couple of days ago I started in my very first race on Zwift (only took part in some group rides before).
When analysing results I’ve encountered odd thing (a bug?). Total activity duration is actually shorter than my race result. I stopped activity after passing the finish line, results did appear on a screen but I didn’t noticed the numbers, only see it on Companion App now and same result is on Zwift Power.
What’s the reason? Does the time elapsed while moving from the pens to the starting line counts toward the total race result but doesn’t to the activity time (only explanation that came to my mind)? Do I miss something (as I wrote it’s my first race attempt) or is it a bug? Sorry if it’s obvious, or the topic is redundant but haven’t found anything relevant in the history.

Screenshot from the Companion below