[Решено] Can't delete “stuck” translation

Background of the issue:
I am trying to delete an existing 'stuck' translation job. Here is a short video of the issue: скрытая ссылка. The issue can be seen on this page: скрытая ссылка

Symptoms:
The system does not delete the 'stuck' translation job. An error message says that I successfully deleted it, but when I reload the page, the job reappears.

Questions:
Why does the translation job reappear after I delete it?
How can I permanently delete a 'stuck' translation job?