Are you talking about “spells known” or “spell slots”? For “spells known” you have to add them under the new class.
If you mean “spell slots” then it’s a function of how multiclassing works. You don’t get slots based on individual classes, instead the two classes add together to determine your spell slots.
Spells Known and Prepared. You determine what spells you know and can prepare for each class individually, as if you were a single-classed member of that class. If you are a ranger 4/wizard 3, for example, you know three 1st-level ranger spells based on your levels in the ranger class. As 3rd-level wizard, you know three wizard cantrips, and your spellbook contains ten wizard spells, two of which (the two you gained when you reached 3rd level as a wizard) can be 2nd-level spells. If your Intelligence is 16, you can prepare six wizard spells from your spellbook.
Each spell you know and prepare is associated with one of your classes, and you use the spellcasting ability of that class when you cast the spell. Similarly, a spellcasting focus, such as a holy symbol, can be used only for the spells from the class associated with that focus.
Spell Slots. You determine your available spell slots by adding together all your levels in the bard, cleric, druid, sorcerer, and wizard classes, and half your levels (rounded down) in the paladin and ranger classes. Use this total to determine your spell slots by consulting the Multiclass Spellcaster table.
If you have more than one spellcasting class, this table might give you spell slots of a level that is higher than the spells you know or can prepare. You can use those slots, but only to cast your lower-level spells. If a lower-level spell that you cast, like burning hands, has an enhanced effect when cast using a higher-level slot, you can use the enhanced effect, even though you don't have any spells of that higher level.
For example, if you are the aforementioned ranger 4/wizard 3, you count as a 5th-level character when determining your spell slots: you have four 1st-level slots, three 2nd-level slots, and two 3rd-level slots. However, you don't know any 3rd-level spells, nor do you know any 2nd-level ranger spells. You can use the spell slots of those levels to cast the spells you do know — and potentially enhance their effects.
I’m having trouble with 1st level spells with my multiclass, I should have 8 but instead I have 4. Also I have 2 4th level spells when I shouldn’t.
Are you talking about “spells known” or “spell slots”? For “spells known” you have to add them under the new class.
If you mean “spell slots” then it’s a function of how multiclassing works. You don’t get slots based on individual classes, instead the two classes add together to determine your spell slots.
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Sounds like you are talking about spell slots. You are a level 3 spellcaster I take it?
Thanks.