In combat log, a text line states: "Syndic Priest provided 100% extra defensive points", which is a different kind of bonus.
In the actual detailed defense calculation values, the calculation shows: "Unit Feat Mod: +300%", which is also a defensive (hitpoints) bonus (instead of attack value), but times four in this case.
(There are no other unit feats, except an Anima priest which should give XP bonus).
These three statements don't match...

