Why is my lock screen image just a black background rather than the image I set for it?

I’ve been trying to configure some focuses on my iPhone to organise and make my life easier, particularly when I’m gambling. Whilst doing this one of my images won’t make itself visible on Lock Screen, it’s just black. When I change it to something different it works. The image worked for about 5-10 minutes and then just went black. And also the background on the home screen blurs itself even though I made sure to uncheck the blur option when setting my backgrounds. Any help fixing this would be highly appreciated. I’ve attached some pics of my problem. The background for my Home Screen shows briefly whilst unlocking the phone too which is odd.