Heading Images?

I’m trying to solve a problem, and if you’re a reader, you can help.

When you open my ebooks on your device, is the heading image centered, or is it off-center?  The heading image looks like this:

I think it’s appearing centered on some devices and off-center on others, like this:


What does it look like on your device?  Feel free to comment below or write me.

Thanks!