Paul returns to his home and I guess we could say it's so far removed from the war that it may seem a surreal experience to Paul. He has been at the front, "up close and personal," and there is a stark disconnect between those still wrapped in the innocence of not truly knowing the stark realities of war and those who can think of little else. There may be shortages of food and such, but all these people have to judge the war on are stories. Paul does all he can to keep the real truth from his mother because she is sick.
Paul sees familiar sights, but things don't feel familiar to him. This is because while the town is unchanged, Paul is not. He may be able to recall memories of his youth, but that person is gone forever, lost in the ferocity and carnage of war. Even in his house, there is that separation, and Paul notes...
...but I am not myself here. There is a distance, a veil between us.
If there is any injustice, perhaps Paul experiences it when he meets an army major in the street who dresses him down for "behavior unbecoming..." This seems unjust after what Paul (and others like him) have gone through.
And while Paul changes into his old civilian clothes, they don't fit; symbolically, this represents the many changes Paul has gone through, supporting again that sense of disconnect or alienation.