URL with trailing slash leads to 'text only' version of 404 page

I’ve just discovered that on at least one of my sites, if a dead URL is entered without a trailing slash, it correctly redirects to my 404 page. However, if there is a trailing slash in the URL, it leads to a ‘text-only’ version of the 404 page. It also seems to be leading to the mobile version of the 404 page, even on a desktop. There’s a giant hamburger menu icon showing.

This works as expected -
https://homes4life.net/wrong-page

This gets a text-only version -
https://homes4life.net/wrong-page/

Just tested all other sites, and it’s happening on all of them.

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