Mercedes-Benz B200, the rear wheels of the two cars look like the outside picture. Is this normal? The 4S shop said it was normal because of the independent suspension system? Is that so?

It's the rear wheel, right? This is normal. This is the problem of soft suspension. If it is the front wheel, it is not normal.

The two tires of the rear wheel should be 8-shaped. But not too biased, a little biased! Look at other cars carefully. They are usually like that. It's just a matter of more bias and less bias.