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Yes -- precisely. We sample to try to keep the data manageable while you're massaging it, but there are operations like a join that can increase the number of records, so we will apply our sampling logic on top of them as well.
You should absolutely see the "Sampled" badge when this happens -- and this should draw your attention to the fact that the join results may be misleading. If it's not showing up for you here (and if those columns really are all "1" as it appears) then it's definitely a bug.
Thank you! Yes, I was pretty sure the "Sampled" badge showed up at first, but subsequently disappeared. Your explanation makes perfect sense and yes, all the values are 1 for both fields.