We have be serval times at Barclona by ship. The information on the ports website has ever been correct.
18B is at WTC (also 18 A and 18 B) = Moll Barcelona
Moll Adossant is separeted in A, B, C, D, E usually used for bigger ships
Azamara nearly never docks at Moll Adossant. Just this spring when WTC was closed.
I have attached the map of the port and here the link to cruise forecast of Port of Barcelona.
https://contentv5.portdebarcelona.cat/cntmng/gd/d/workspace/SpacesStore/f8e2f474-b8c4-46bc-9244-606d48444bca/en.22-10.pdf
Planol_Guia.pdf