Thanks for the help. I'm a newbie editing labels. I guess I'm a bit confused about the discrepancies on how the map is being displayed in OSM, vs how it shows in apps such as OSMAnd and CoMaps/Organic Maps. Neither of these show the exit codes properly. I thought the issue layed upon the map itself, but not sure exactly what's the issue. Sheung Wan subway stations show a bit borked (A1 is missing the exit code in CoMaps/Organic, and A2 is showing as 'Wing Lok Street [A2][A2]' in OSMAnd). I can see in the Tsim Sha Tsui subway station, both B1 and B2 are missing their exit code in Comaps, and somehow OSMAnd only shows B2 label at a higher zoom level than B1 (?). 
Is there a way the default view on most apps would show something a bit more unified? What would be your suggestion for this?

Thanks!