I just got a 5 pk of Boge 2.0 cartos and 4 out of the 5 tested at around 2.0 ohm. The 5th one is crazy. The meter jumps around all over the place and won't settle down. The lowest I've seen it is 7.4 ohm and the highest was over 75.0 ohm. It stayed at 50.0 ohms for a few seconds then started jumping around again. What could be causing this?