PROBLEMS WITH SLIDER

I have set up the slider on the home page with 5 featured image posts. All 5 images are showing up on my computer but when I look at my website on my tablet or cell phone, it only displays the first 4. The 5th image isn’t displaying. I have checked my settings and to make sure I have added all the post IDs and I have.

I don’t understand why it’s (#5 image) not showing up on my cell or tablet. This website is for a customer of mine and she said it shows up on her computer but not on her ipad or cell either.

Please help. Thank you.