Why do does one product display all pictures of variants?

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I am using Shopify for first time by using Theme "Debut" for preparing product with 3 variants (three options).


When one product is selected with "drop menu" in Catalogue/Shop,  pictures are showed for all three options instead of only the selected option (variant). 


Anybody knows how to show only pictures for each variant?


Other Themes will have the option for show only pictures of each variant? 


Thanks in advance for your replies...