EBay added £10 on to my listing, ive tried changing the price and it still ends up with £10 added on

You give location as UK, but country of origin USA, so I suspect ebay classes it as Import and adds VAT.

Priced my item at £50 but eBay listed it for £60 | Member To Member Support

Priced my item at £50 but eBay listed it for £60 | Member To Member Support | eBay UK