Interesting, harvest should not be 9 days on any island so far as I know. Sa basically it looks like BT has been bugged for quite some time and people have just put up with it? They were calling you crazy cause they knew the way it SHOULD work and might not have a character on BT to know that the continent appears to be bugged.
AFAIK, it's been that way for over 5 years at least. A lot of devs play on BT, and none of them noticed? Any normal player would be inclined to think it's like that by design.
I never realized it was different on other continents, though. Dwi had seasons since so long, and I never played a meaningful role anywhere else.