No personal records for Pool Swim activity

I've been using my Instinct for a couple of indoor pool swimming workouts during last month. When activity finished, it has been sent to my mobile phone succesfully, I can se the detailed stats in Connect app in my phone and on the Connect website. But so far I don't see any personal records in History/Records menu on my watch, neither in Connect app. I only see Running (empty) and Cycling (populated) entries on my watch, but no swimming. My single workout is usually around 1km total and I use 33m pool length. Does anyone know what I might be doing wrong?