There shouldn’t be… All of my attempts at using (centered) images in buttons have worked as expected.
Even attempts at resizing to odd dimensions results in the expected placement. Is the image by any chance not centered (as in the house is literally on the right-side of the image file)? Could you post the image you’re using in this thread?
We have noticed some oddities with how different browsers render the images within buttons (Firefox seems to render a bit t the right for some reason) but within the Designer you would not see that.
Chrome:
Firefox:
