I would expect the wrongly supplied tyres are due to someone putting the incorrect tyres in a specific 'bin' and the person collecting the order picking them up and not seeing the need to check as only the ordered tyre should be in the 'bin'. Last wrongly supplied item I saw no immediate need to return was a complete pack of paint brushes rather than the single brush I had ordered. Needless to say the supplier noted after a couple of days they were oddly out of stock of the paintbrush and asked for the pack minus one back freepost.