This is a cosmetic issue.
When a Virtual Device (Virtual System / Virtual Router / Virtual Switch / Virtual System in Bridge Mode) is created in a VSX Cluster object via SmartDashboard / SmartConsole, the relevant VSX configuration is pushed to all VSX Cluster members.
Some VSX settings are configured on VSX Cluster members only during policy installation (e.g., IP address that will be displayed by the ifconfig command).
By default, Virtual Router device always has its default policy, which is automatically installed when any change is made in Virtual Router object (interfaces / routes).
In case another Virtual Device is connected to Virtual Router via Warp connection, the VSX configuration is pushed to both the Virtual Router and the connected Virtual Device. However, the default policy for Virtual Router is not installed automatically. As a result, output of "ifconfig" command in the context of Virtual Router displays "Funny IP".