Wrong subtitle. This article doesn't have a subtitle.
When an article has no subtitle, you take a wrong subtitle from one of the other articles that are displayed below the current article. So, if you update the IV, there could be other subtitle (or there could be no subtitle—but only because there is no other article with a subtitle on the page).
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When an article has no subtitle, you take a wrong subtitle from one of the other articles that are displayed below the current article. So, if you update the IV, there could be other subtitle (or there could be no subtitle—but only because there is no other article with a subtitle on the page).
Other examples:
https://ominho.pt/mesa-dos-tres-abades-celebrou-a-uniao-em-viana/
https://ominho.pt/swr-barroselas-metal-fest-foi-para-isto-que-se-fez-o-25-de-abril-e-o-26-27-e-28/