Yep, you were absolutely correct. There was a typo in there. I have now released version 0.1.3-beta where this is fixed. I have set the number of decimals for 2ACoin to 8 (previously was 4). I am not sure if this is correct, since block explorers seem to show the decimals set to 4. In any case, you can now modify this value using the WordPress filter.
Many thanks for spotting this bug.