A change of ports is common enough but the expected weather must be prtty rough to keep passengers at sea an extra 3 days.
https://www.independent.co.uk/travel/news-and-advice/royal-caribbean-cruise-explorer-seas-refund-caribbean-islands-storms-a9181031.html?utm_medium=Social&utm_source=Twitter&fbclid=IwAR0nAhaA-rk6Tkw1TxIudtedBh4FnoZBU-iVOUV1_mzecUnU3qbon-glbTk#Echobox=1572620590