Question Problem with PDF attachments

We have a problem with pdf attachments to posts on our website.  The behaviour differs slightly depending on browser; in Firefox the attachment is downloaded with a hashed filename (from the filename field in the kunena_attachments table) and no extension; in Chrome and Edge, the file opens in a new browser tab as a text file.  Other filetypes (.docx, .xlsx, and .txt) download in all three browsers with the correct filename (from the filename_real field in the kunena_attachments table).

There is a post on our test website which contains all four attachment types:

Any help would be much appreciated.

Rob

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maybe also update the kunena bl;ue-eagle template first, this one seems a bit old to me.
www.kunena.org/download/templates/blue-e.../blue-eagle-5-v1-6-7
But it could also be the settings of your web browsers

That's the latest version of the blue eagle template. I realize it's old, but that's it.
I doubt that it's a web browser setting. My usual browsser is Firefox, and I may have tweaked something there; but the other two are both stock-standard, latest versions.
The weird thing about the problem is that, for pdf filetype, the file which is downloaded has the wrong filename; there is no translation from the 'filename' value (which has no extension) and the 'filename_real' value (which is correct in the table). That transaltion occurs for the other filetypes I mentioned and tested; it also occurs for image files, which also open correctly in all three browsers.

If you got to our testsite -

well i want to look at your test site
but I don't see a link to it if he is stopped here
then type the website name without www or htpps etc

I tried a simple version of the site name last post, but it also got blocked. Here's a text version - hope this works:
j3 dot birdlifephotography dot org dot au
Go to the forum section via the top menu. My example post is the top one in the General Discussion category.

ok i will check the website.
but i just made a kunena report on my own
and then I get to see this with the last blue-eagle
Kunena default template details : Blue Eagle5 | author: Kunena Team | version: 1.6.7 | creation date: 2022-01-01
so see if you can download this version here
www.kunena.org/download/templates/blue-eagle

Thanks for the template info. Don't have time to do that now; will check it out tomorrow.

This is the same problem with the Aurelia template.

don't know if update can fix it but you never know
I think I can only see this if I'm logged in to your forum but I can't I can't register.
"There is a post on our test website which contains all four attachment types:"

The post on our test site can be viewed by guests. The topic is "File Attachments".