This is happening for the second time. During the game yuyuiyui, in my battle between Kaziu, my Yeti was ambushed by a +24 group Ambush spider. Which shouldn't have happened. The battle screen shows
Spider +24 Ambush
Yeti -30 Warding
Result +17 Ambush
What kind of Math is that?
And further on the line , a Ghost with +49 Ambush and Yeti -30 warding resulted in +49 one time and +34 the other time. Is this a known Bug???
Before this I encounter the same problem with Ranger. In that case She was carrying an item so I though maybe it is a rare bug. However now I can firmly state that Ambush-Warding calculations are inaccurate.