Are you able to clear the cache and cookies of your browser and try uploading the images again please?
You'll also want to make sure your image sizes are any size up to 4472 x 4472 px, or 20 megapixels. Here is a help guide from our Shopify Help Centre on Product Images.
However, if the issue continues to persist after clearing your cache and cookies, let me know and we will continue looking into this.
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