Private sellers do not have different colours and sizes.
You obviously did not tead recent announcement, which included this so you need to get registered correctly before ebay gets round to restricting your selling
More steps to address false private sellers
At eBay, we are dedicated to ensuring a fair and equitable marketplace for all business sellers. To achieve this, we monitor trading activities, and we’ll continuously help business sellers using a private account to transition to a business account, or restrict selling activity as necessary. In addition, we’ve reduced the number of free listings available to private sellers.