An even simpler reason is that your cat considers your house her home and you’re part of her family. So, of course, she’s going to bring her litter to you. After all, this is her home, too, and she wants to bring her family together!
It’s normal for a mother cat to move their kittens around, especially in the first few weeks of their life. She does this to find a cleaner nest, a better location for hunting or because she needs a little kitten help!
In some cases, cat moms may decide to only bring you one kitten and leave the rest behind. This could be a major point of concern and your cat could be telling you that there’s something wrong with the kitten.