weblinks used as "tiny urls" only work when at the root level

Hi,
I’ve been using weblinks as "tiny urls" for a while : I create a simpler url, say "mysite.com/mypage" to link to a longer one. Typing the tiny url in the browser gets it turned into the real url (the friendly one in my case).
This works perfectly when the weblinks live at the root level of the document tree. But as soon as the very same weblink is put inside a folder, one or more levels beneath the root, the "tiny url" doesn’t work anymore : I get a "page not found" error.
This issue is happening on a 9.5 version (may need to update btw), and I haven’t tested yet on a more recent version.
Thanks for any insights,

Definitely upgrade to a more recent build.

Thanks for the answer !