pixel_player237683215 ooouuufff, chalk that up as a "learning moment". Unfortunately that is how "levelling up" works during events. Events use your 2 "most recent" regions. By entering a new region your "active" set, in your case previously San Francisco and Rotterdam, drops San Francisco and adds Scandinavia. You will no longer get "oil spoil" jobs for San Francisco.
Make the best of the current event, maybe pick up a good ship or two. Use any keys you saved up to buy 100 or 200 key containers (most folks recommend the 200 key one). You might want to start planning what you'll do as you approach Osaka. Again, most folks play the "slow - long game" and try to avoid a lot of XP while they save up keys and parts. The "best" plan is to get to within 10-15 levels of a new region, avoid collecting the event rewards until entering the new region. Perfect timing would be to arrive at the new region just as the event is ending (or in the 1-2 day "grace" period at the end).
Keep in touch, let us know how you're doing or if you have some questions.
PS, some Mod may want to split out these two replies as they really are not related to identifying Bluto or Olive 🙂