“Search on the forum” with “Section” returns topics only the interface language

I have merged the forums in all languages, but when I search for something in a section, the system returns topics published only in the same language as the interface. I expect to see topics published in any of the languages I select in “merge forums”.

It works when search in all sections..

disregard

For example https://en.numista.com/forum/forumm.html returns all the topics I posted in, but I can not search all the topics I posted in the “Numista website” section (the system returns only topics from the “Numista website” section in the interface language).