There are a number of possible explanations. Could be struck on a foreign planchet which is composed of something magnetic. It's really hard/impossible to say, let alone verify, without seeing good quality pictures or the coin in hand.
Virtually any digital camera sold today will have a close focus macro setting (usually denoted with a flower) which will enable you to take a decent picture. If you don't have access to a camera, try taking it to a local coin dealer (or coin club) and seeing what they think.