Nope.
Haha thanks for confirming it's not just on my end. I ended up winning surprisingly easily second time round by keeping my cavalry mounted and just kiting their melee cav. Winning seems to resolve the issue.
Several of my units have -21474 for most of their stats. I tried deleting the units and creating new brigades but these also seem to have the same problem. Is there something I'm doing wrong or is it just a bug?