The last two bugs posted above happened pre-patch as well. Did you have a reinforcing stack with a unit that couldn't make it to the battlefield during battle - most commonly a saker or demi-cannon in a reinforcing stack?
That was the case for me any time I came across the bug you guys are reporting. It swaps the men among the units. e.g. my line inf. went down to 18 men, and my demi-cannons to 104 men!
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