These are almost certainly bugs.
The in-campaign and in-battle unit card stats are different. In a battle, Galleys have 0 Firepower and 1477 Hull Strength. In campaign, they have 256 Firepower and 0 Hull Strength.
They can also be incredibly hit-or-miss. A few galleys can KO an AF, 5th Rate with one volley. Or they can blow up at close range like suicide bombers and take down your ship with them. At other times they blow up at a safe distance away.
In any case, CA needs to fix naval unit card stats ASAP and re-examine galley balance. After all, both their unit cards say they mount, "light cannons."
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