Change of Itinerary

Does anyone know why Celebrity Solstice changed their itinerary on the October 23 sailing out of Barcelona?

What is a berthing issue?

No room at the inn!

This has come up on an earlier thread.

Berthing issues mean that too many ships are scheduled to be in port on the same day, and somebody has been turned away. It could be that when the schedules were written months ago, all appeared well, but later some construction on one or more piers needs to take place, so schedules are re-vamped.