Just a guess but maybe it’s the method of measurement that differs and not the actual sea level.
Perhaps this is some side effect of the moon? As we know, the moon is responsible for the tidal actions on the earth and nobody seems to be considering that some of this might be a result of changes in the moon? Or changes in the the moon’s orbit around the earth? Maybe we should create a “Star Wars” deathstar to put in orbit around the earth to counter the effects of the moon’s high tides?
These people are idiots.