Dear Margaret,
I indeed think it is a problem of choosing the options when you resize your image. I don't know which software you are using, but you might have the possibility to click on something looking like a chain, or maybe somewhere where a word like proportions is written.
If you resize only one side of your image and not the other one, then the proportions are no longer respected.
If you do not mind, I would like to add another advice, since I think your work deserves to be rendered as nice as possible.
I was thinking that you might want to choose your image quality somewhere when saving it. I would advise you not to hesitate to choose the highest quality or the medium quality. It would prevent your image from being pixelating (is that the correct word?).
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