Sticky posts not working on Oxygen theme after changing domain name

I recently changed my domain name (wanted to change my blog name and URL), and I’m not even sure I did that right. But anyways. The new URL works, the domain name works, but I just made my first post as my new domain name and I want it to be a sticky post (to show on the homepage slider on the Oxygen theme). However, when I turn the sticky option on, the post disappears! I turned the sticky option off on my current sticky posts (under my old domain name) but they’re all still on the slider (as if still sticky posts).

Why aren’t my sticky posts working and how do I fix it? Thanks!