It sounds natural to be. You can always send in a report with the "send report" button on the bottom.
...on a walk, suggests to me that it was an organized walk and could involve a group of people.
Hey there/ FYI: The slower speed recording for this sentence, I believe, is inaccurate.
What exactly is inaccurate? The slow audio sounds kinda strange by definition, but seems fine to me.
Hi Mr. Jellei. Unfortunately, I can’t make it play again once I’m out of the lesson so I am unable to tell you why I thought it was wrong. Since you’re our resident All things Polish expert, I will bow to your ear and next time I am in this lesson, I will see our discussion and keep that in mind when listening to the pronunciation.
Recently I see more comments similar to yours, so perhaps there is indeed some bug and what I hear when I check the database isn't necessarily what the learners can hear. Or at least some of the learners, let's hope it's not like 'it's wrong for everyone'.
Well, they're like "to go on a walk" (to leave home in order to take a walk) vs "to be on a walk", "to stroll".
So for example "On spacerował" would be closer to "He was walking (walking around, just for the sake of walking)" or "He was strolling".