Discrepant / Irregular data when clicking on units in-battle, or hidden flags?

[tinkthank]

I had been wanting to check out exactly how much bonuses and penalties to e.g. precision and protection etc. units receive when "storm" or "wind guide" or "mass protection" is cast, and found some disturbing results.

For instance, my Caelian army under the influence of a Staff of Storms had a 9-precision penalty -- one could see "Basic Precision: 12, Experience Bonus: +2, Current Precision: 5". I became confused when I clicked on their Indy opponents in the same battle at the same time; I got "Basic Precision 10, Experience Bonus +2, Current Precision 7" -- but that is only a Storm penalty of -5. What can explain that?

Having become suspicious, I started clicking often around the battlefield in various contexts, and often find (for me: unexplainable) differences in statistic values. Are these generally hidden flags (e.g.: the unit in question is under the influence of something whose explicit existence is not flagged?), or errors? This ranges from discrepancies between "basic" and "current" (e.g. Basic Defense: 10, Frozen: -3, Current Defense: 11) which I guess come from holding a particular weapon or shield or something to those bizarre precision differences.

Thanks for your help