Custom Field URL link not passing through in customer HTML Code

Hello -- I have created a HTML code email, which is using a custom field I created for my contacts, which contains a short URL. It is not working as the email output seems to be converting the link to an "x-webdoc://53106D84-443E-4F46-9C42-3B1D6237A6DD#" link which won't work. It appears clickable but is not using the URL from the custom data field. What am I doing wrong?

HTML code is is a button link:

<a href="[[custom.list_url]]" target="_blank" data-trackable="true" style="color: #ffffff; font-family: Poppins,= sans-serif; font-size: 18px; word-wrap: break-word; font-weight: bold; text-decoration: none;">[[custom.list_name]] List</a>

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