on the source code I can see following text: "Could not format Special:Contribution row". Normally if there are no public changes in the contributions, there should be text "No changes were found matching these criteria.".
This IP's contribution https://fi.wikipedia.org/wiki/Aihe:T0uu0t1h13sj9utk was deleted. And the same IP also has one other deleted contribution from 6 years ago. I think that's related to Flow.