I've looked into this and it appears to be working correctly.
On the current Peace Server, your (Milady) strength was not quite 100. Was it at 100 due to bonuses? I checked data from recent backups and your strength was also below 100. That's one possible cause.
Also it's possible that you when you planted the seeds your stats were below 100. The quality of the plant is affect by your skill and stats both when you first plant the seed and when you harvest.
I hope that clears up the situation. If you still think something was wrong, let me know and I can go through further back ups of the data but my tests work fine and I see that other players have been harvesting 100 quality crops.
Thanks!