Perhaps due to a request failure? I did not receive an overlay prompted for the article is currently being translated by another user (although he has no recent activity) when the translate start.
I final cannot to publish it due to an error, had to manually copy and publish it.
I also found that I can't remove this entry from "In progress", it got an error from API: code: invalidtitle, info: Bad title "LINPACK".
information: wikipedia en->zh, LINPACK article.