The text that is supposed to be shown only when the quest is incomplete, is shown for completed quests too. The issue comes from the fact that "RequestItemsText" field is used for two different things. Obviously like its name implies, it is used to hold the text that is displayed when a quest requires certain items, but for quests that don't have an item requirement, it holds the incomplete quest text. That text is not supposed to be shown if the quest is complete, as is obvious from every old retail video.
An easy to test example is the Cutting Teeth quest in the orc starting zone:
You can see that on retail, it goes straight to offering the reward. You should not have to click "continue".
All that is required to fix this is to add an additional check in PlayerMenu::SendQuestGiverRequestItems to see whether the quest has an item requirement before calling SendQuestGiverOfferReward. If it does not require any items, the text should only be shown when the quest is incomplete. Currently it only checks if there is a RequestItemsText.
Fix that i submitted to Elysium -> https://github.com/elysium-project/server/pull/1001/files