This entire road, stretching from Portslade Station to Kingsway Road, is lengthways split into two roads/names: the East side of the road is Boundary Road (the boundary between Hove and Portslade), and the West side of the road is called Station Road.

So for the address which I indicated with the note, this is being seen as "56A Station Road" on OpenStreetMaps, but this is incorrect: this should be "56A Station Road" (before making this note, I added this "56A"-building myself).
The building seems to be labeled correctly on here, but if you search for "56A, Boundary Road, Portslade" on OpenStreetMaps, you will see that it will lead to this location, even though that's incorrect.

I've also added the same note for its "twin" on the other side of the road.

Please divide this street into two lengthways, each with their individual name: East side of the street is "Boundary Road", and the West side of the street is "Station Road"

This entire road, stretching from Portslade Station to Kingsway Road, is lengthways split into two roads/names: the East side of the road is Boundary Road (the boundary between Hove and Portslade), and the West side of the road is called Station Road.

So for the address which I indicated with the note, this is being seen as "56A Station Road" on OpenStreetMaps, but this is incorrect: this should be "56A Boundary Road".
The building seems to be labeled correctly on here, but if you search for "56A, Station Road, Portslade" on OpenStreetMaps, you will see that it will lead to this location, even though that's incorrect.