I'm playing a 2nd level warlock, 7th level fighter and it says I know 4 spells but the spell chart says warlocks only know 3 spells at second level. can someone help me with this?

Please post a link to your character so somebody can look at it for you.

https://ddb.ac/characters/22422277/UWfmLH

Totally forgot. Thanks.

From what I see, you only have 1 warlock spell selected yet. The rest is from items and features. You probably need to chose more spells.

You know Levitate because you are an Air Genasi, Speak with Animals and Bane from your Eldritch invocations, and Detect Magic from your [magicitem]Wand of Magic Detection[/spell].

You know Chill Touch and Eldritch Blast as your two Warlock Cantrips, and Wrathful Smite as 1 of your Warlock spells, you should still be able to learn two more Warlock spells to bring your total to 3 as a 2nd-level Warlock.

Yea. Levitate is from Air Genasi - Bane and Speak with Animals are both from invocations and Detect Magic is from your wand. The only actual Warlock (levelled)spell you have is Wrathful Smite. So you should have two more but don't.