Where has my History proficiency come from?

I’m new to DnD. I was typing up my character sheet (I’ve decided to do this every now and then as my annotations become more messy), and in the process I didn’t spot any reason for me to have the History proficiency I have.

It’s likely that I just made a mistake when making the sheet, but maybe I didn’t…

I’m a Dragonborn Paladin with an Outlander background and my subclass (Oath) is Redemption. According to this wiki, the race or subclass doesn’t give me any skill proficiency, while the background gives me Athletics & Survival and the class gives me a choice of two from Athletics, Insight, Intimidation, Medicine, Persuasion & Religion; I chose Medicine & Persuasion. So the 4 skills I have from my background and class are Athletics, Survival, Medicine & Persuasion… none of those are History (which I have in addition).

I also noticed an “origin” feature for my background, from which there are 10 origins: Forester, Trapper, Homesteader, Guide, Exile or outcast, Bounty hunter, Pilgrim, Tribal nomad, Hunter-gatherer, and Tribal marauder. The wiki doesn’t give any information on those, and I haven’t got one written on my sheet.

I’m currently Level 4; I don’t believe a level feature has given me an extra skill proficiency so far.

Where might I be getting this proficiency from?
Does my “origin” have anything to do with it?
What are the possible ways of getting a History proficiency?
Have I/my DM simply make a mistake when creating my character?