Fighting partners

I'm not sure what it is, I haven't downloaded any new packs and I'm on Xbox. But I get on, make some sims who are partners and move them in, after making my house in the cottage town they automatically start fighting. I tried apologizing and fixing it but they kept arguing and wouldn't stop. So I remade and moved them to the pets lots and their 'happiness" went down fast, argued a lot, their relationship kept going down, and in the span of 2 sim days they fought again. I'm not sure what is happening, I checked everything, the neighborhood thing and everything and they just keep wanting to fight.