Self Charging Capacitors?!

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Hi,
After a recent trade I have gotten some 230000uF, 25V caps. When they arrived, I checked their voltages present. They were all around 1.5V to 2.0V. I discharged them with a 1R 5W resistor, and they discharged immediatly. However, whilst I sat there, I noticed them GAINING charge! They were going at about 5mV per second. I thought they may have been "stealing" charge from the multimeter but I took the multimeter off at 20mV and when I checked again, it was at 32mV!

Is this normal & what is it?!

Thanks,
Gaz
 
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