I'm not sure this question belongs here, but you guys are the only ones who could probably find an answer so.. 
I'd bought a few issues just the other day, and it seems that many issues take place between STIII (TSFS) and STIV (TVH) with Admiral Kirk's crew on the Excelsior, with Saavik as Science officer, and Spock commanding the USS Surak.
Does anyone know how it was explained in light of STIV's opening scenes on Vulcan?

I'd bought a few issues just the other day, and it seems that many issues take place between STIII (TSFS) and STIV (TVH) with Admiral Kirk's crew on the Excelsior, with Saavik as Science officer, and Spock commanding the USS Surak.
Does anyone know how it was explained in light of STIV's opening scenes on Vulcan?