Okay, so

I just noticed, that my favorites tab includes samples that I do not recall marking as a favorite. I can click and listen to the samples, but when I do, it doesn't show the highlighted heart on the right. I first thought those were samples that I favorited a long while ago, but some of them were brand new, or useless to me or myself back in the day.

The problem is

My favorites are mixed with a lot of random samples which makes my favorites tab a complete maze, and I can't find the samples that I actually do recall marking as my favorites.