You mean Lukaku can scored 4 goals in the international break, when Belgium plays against Azerbaijan? Actually, Azerbaijan doesn't have many good players, so it's reasonable that Lukaku was able to scored 4 goals in that match. But yes, it was also a good performance from him. And Lukaku should be able to scored more of goals at the Roma club later, because his confidence will increase when he returns to the club.
When an elite player like Romelu Lukaku meets an oppositions, knowing full well he can handle them without struggles, he will ensure he's outstanding. Romelu Lukaku can score multi goals against his opponents in country games, he's fit and can do that without experiencing difficulties. When a top profile like Lukaku bagged good scores and goals against oppositions, the first thing we check is the team behind such outstanding results and the oppositions that turn out to become victims of defeats. Belgium is filled with incredible players that enchance the team's performance.