https://travel.state.gov/content/travel/en/traveladvisories/traveladvisories/seychelles-travel-advisory.html
https://www.gov.uk/foreign-travel-advice/seychelles
as I post, that doesn’t show anything special that looks alarming. My completely fact-free wild guess would be it has something to do with port access fees or procedures, or availability of tours from their excursion providers. If not that, maybe sunspots? 🙂