Not letting me purchase items

Tried buying a graphics card for my PC last night and when I attempted to check out I got the message

"Unfortunately, you can't purchase from one or more of these sellers right now."

 UK buyer. Only trying to buy the graphics card and nothing else, so I'm not sure why it says "one or more" instead of just "this seller." It seems to be a problem on my end since it's happened with two separate listings (the first one sold before I had this issue sorted out so I tried the second cheapest one).

Tried purchasing again today but instead of last night's message it now says "Your payment didn't go through. Please check the payment info you entered or select a different payment method." All my payment info is correct, I've no clue what the problem could be. Also tried buying it on my phone, with both my card and Apple Pay, but both times I got the first message.

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