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We have got access to your website then fixed the issue for you.
We chose again size of product thumbnail on WooCommerce > Settings > Products. You can see this image: http://prnt.sc/d8pm7u
Then regenerate thumbnail for you > this page: http://newschoolstore.com/magazin/ works fine.
Thank you very much.
Don't hesitate to ask us if you have many questions. We will try to help you as soon as possible.
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