Portal bug

[ams16]

I get a weird bug when I'm trying to port to a city with a maximum number of units vectoring in. It shows me the hero inspection screen.

To be precise: I try to portal a unit from a city to another city that is already getting units from 4 cities. It rejects this, saying I have too many cities vectoring to that city. But after I click "ok", it shows the hero inspection screen.