Because the two islands at the bottom of the board separated by one sea hex are considered as one island for scoring purposes. That means that the first settlement there is worth two points, but the second is only worth one point
@Developers@KOSMOS@administrators Have you seen this thread? I can confirm this is a problem. In many Multiplayer custom games, there are often 2 robbers. At least one of them, maybe both are active. In one game recently, a player settled on a resource hex where the robber was located at the start by default. When that number rolled, the robber blocked the resource. Up to that point, the 7 had not rolled. I sent a bug report in on C&K Oceania game. Please look for a report of a player named gdrive96. That was the only way I could figure to report before finding this forum.
The admin on the Discord server said they are having server issues again - nothing they can do directly since they don't own or maintain the servers. They contact that out to another company and they are trying to get it fixed.