CSS url rules not relative to css path in account endpoint areas. IE. subscriptions

It was my mistake.
I forgot I was using a preload link in the head of the file.
In the head of the html I had:

<link rel = "preload" href = "../wp-content/themes/themename/locationfolders/font.woff2" as="font" type = "font/woff2" crossorigin />

Note the .. at the start of the href

what it should be is:

<link rel = "preload" href = "/wp-content/themes/themename/locationsfolders/font.woff2" as="font" type = "font/woff2" crossorigin />

This is still “relative”, but to the home URL… which is what I was after.