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Do you sell many of these strange fuzzy things?
On VM Configuration/Shop/Advanced Settings you have "New Admin Template" set to NO - or you have not installed the new template with the VM package?
The new template was introduced 2 years ago. https://virtuemart.net/news/503-release-virtuemart-3-8-8-updated-administrator-interface-template-design and has been steadily developed since then. The style can be changed using the options under the New Admin Template switch.I don't have a problem with image sizes.