I appreciate your reports.
Um, that is a special butterfly. Not sure how it got there!
Den of evil and few of the other monster infested areas are empty if you disabled random encounters.
I left the Ranger's Guild quests as repeatable because you can earn reputation at that city. Other cities you earn reputation through the main or side quest lines. The reputation is used later to purchase end game items.
Thank you for warp and earth dragon bug.