I posted a comment in one of your new items post a couple of days ago, I noticed you had them set wrong.
You have entered all the sizes like one option separated by commas, you need to add them as separate options.
I have the impression you added the colors like attributes more than options, I see I can select a dress in black or white
What is the difference between them, what does the color apply to, the main color? I found it confusing.
To see how the variations look like in your store the way buyers see them you have to log out.
See how I did it in the image.