Having issues when I try to edit page properties after I moved to a new host

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Hi,

We recently moved our site to a new server, but it is still on the same domain.

Since then, when I try to update properties on a page that existed before the move, I get a javascript alert with my 404's html in it. The Network console tells me it's actually a 403 on the index.php.

If I update properties on a page create after the move, everything is alright.

I'm trying to figure out if there's an issue with my permissions on the server since that's the only thing that would make sense, but I haven't found anything.

Anyone has an idea?