I made a comment in the other thread where you posted this. David (my husband) thinks the bees ran from a “wax quake” when the cells opened:
About the moisture. You say you got 8 kilos from 4 frames. Cedar usually says 3 kilos per frame, so there could be 4 kilos pooling/left in the hive. If there is a big pool of honey in the bottom, I guess that could be causing some of the moisture - did you get a look at the corflute board?
Hopefully everything will be fine today, and the bees will be happily back to work. Thank you for sharing your experience though, we all learn from it. Please keep us updated!