You may experience an issue where your entity attacks, moves, wanders but sometimes (or a LOT) during combat just sits there and does nothing.

This can have many causes but one that often happens is the ATTACK RANGE of the entity used by the Behavior Tree actions is too large and the monster cannot get into it's REAL weapon range (Set by the kit)

Check the attack or weapon range in the action that moves the Entity into attack range and make smaller to see if that helps.

Otherwise there is a Guide on debugging behavior trees available on my channel (I'll add a link soon!)