It seems you tried to enter all the street segments that have the same name as a single way each. That’s not cleanly possible for T-shaped (or even more complex) streets.
We deal with this limitation by splitting the street into as many ways as necessary to avoid having to go back on top of an already-drawn way. In your example, you need at least 4 separate ways to map Via Emilio Lussu, because it contains 3 T-shaped junctions. These ways should all have the same name tag, of course.