Why was my card usage behaviour flagged?

Lemoncurd

Yesterday I was going to buy a cooker hood from a seller with a shop on ebay, I discovered they had their own website and after looking at that had some questions about other items and their prices were cheaper on ebay than their website so I phoned them up. Ended up buying by credit card over the phone and was a bit paranoid because I don't like giving my card details over the phone (they didn't give me any reason to be suspicious it was just me being paranoid).
Today my credit card company phoned to check the last 3 transactions on my account as they had been flagged. The first was a £20 top up for my mobile phone, the second a 58p charge from PayPal - I hadn't realised this would happen but I did update my card details on PayPal yesterday because the old one expired a few months ago, and the third was a £353 transaction to buy the cooker hood. The fact that they'd flagged these tranactions made me even more worried as I wouldn't have expected transactions of these amounts to be unusual for my account.
Is there any reason why they might have questioned them?

Bossyboots

I totally agree with Ian.

michaels

THe only other thing (and sorry to sound worrying) is if there is a transaction with a retailler that a lot of people have had problems with and sort redress from visa/mastercard.