I have found a couple bugs in the dungeon exploration section. [Invigorate] reduces the challenge charges by one, instead of increasing it. 

and using [Teleport] and then recalling/sending back units from a place doesn't change the time spent traveling. only by sending them back through the travel menu does the reduction work. which is less a bug and more a lack of implementation.

I will add that teleport (and auto collection of resources) can disappear from the spell list in the exploration spells window

when you  scoll down you can block the game by making you unable to click anywhere

Exploration skills could have their own tab (maybe also as social skills)