You've tested an email and viewed in on your iPhone. The images in the test email are flushed to one side or the other.
Here is what that might look like:
Typically we only see this when there is an image map on the image or there was at one point. Even though you've removed it, the code is still in the HTML of the file. We call this "Batman Code":
The best way to fix the image map is to delete the image, replace it and relink it.