Bug with druid spells, when you choose the Circle of Land subclass, the spells you gain from biome choice (Coastal, Land, Underdark, etc.) that are always prepared count against your learned spell slots, but if you never change out spells this is not an issue. You will have 8/6 spells prepared at level 3, assuming you do not choose to prepare a spell that you gain from your biome. This means that you can not change spells without giving up spell choices in the process.