Why have eBay reduced my item

[moppy2045]

Why have I received less than the price I listed my item for.  Can eBay reduce the price without my authorisation.  Items listed cheaply make it uneconomic taking packaging & travel to postage if eBay then reduce the price. 

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[**peaseblossom**]

It may be ebay's buyer protection fee.   Details here:
https://www.ebay.co.uk/help/selling/selling/pricing-items/buyer-protection-information-sellers?id=55...