Hi Brian, thanks for your bug report!
I haven't yet been able to reproduce this... There used to be a bug where if COIN made a capture, it could continue making (forced) captures with other pieces, however that has been addressed in v0.6. (As I understand the rules, COIN can only move the SAME piece multiple times in a turn as long as it keeps capturing.)
If possible, can you comment on the circumstance when this COIN double moves occur? Does this always happen for you or only rarely? Does it (only) happen when a capture was made? Does it happen with all AI levels?