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After I click "fetch more" on my my.flightradar24 flights list, I can see empty grey circles though I did not input any seat type information on those flights.

Rest of flights which I did not input seat type information before "fetch more" buttons does not show any errors. Why does it happens?

ps. It happens in both Edge/Chrome browser in Win 10. Also, my account is kht1992 at naver dot com.