No slash at the benning in the internal link. Is it weweb default?

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I noticed whenever I added the link on weweb editor, the link on the published page has no slash (details/16526) at the beginning.

It seems I can’t change this to link with slash(/details/16526). Does anyone know if this is weweb default?

Although the link works fine, I have never seen a link like this so I am feeling weird about this