Server Alias is not showing parent website

I have setup a server alias on my virtualmin server but it keeps trying to redirect to parent.tld:10000 which is the virtualmin management page.

I have no DNS setup on my site at all, so that shouldn’t be causing an issue.

I have tried setting up mutliple server alises and deleting / re-adding the same one but i still have the same issue.

Anyone have any thoughts on this?