product thumbnails are blurred

Hello, good afternoon. I’m having a problem with the thumbnails of individual products in Woocommerce and can’t find a solution. The thumbnails look blurry and I have tried adjusting the size from the customisation options and in the media settings, but to no avail. I have uninstalled the plugins one by one in case the problem is in one of the plugins, but that’s not the problem either. I finally changed the theme and the thumbnails look fine.
Do you have any idea how I can fix this problem? Thank you very much for your time and help.

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