The Oceania web site is still having problems, as of March 25, 2023 evening.
Was in the middle of making shore excursions about 3 hours back, selected those and put those in the cart, but then when I tried to open the cart to pay for those, the cart did not open. Then when I tried to start all over again, it said that I don't have any coming booking in my account and that there is no booking with my booking number (did not have a problem finding my booking 20 minutes earlier).
Hopefully this is just a temporary web problem and my booking was not messed up.
It is terrible that Oceania can't seem to fix its web site problems