URL of origin server shows in source code, not the board URL

There are 3 places on my homepage in the source code that have the upstream/origin server URL (from reverse proxy setup) and not the board URL.

Any idea why it's pulling that and not the board URL?

Code:

<meta data-template-name="public:metadata_macros::share_url" data-template-name="public:metadata_macros::output" property="og:url" content="https://forums.upstreamdomain.com/forums/?nextInternalLocale=en" />

<script>
        window.addEventListener('DOMContentLoaded', function() {...

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