Hi guys! 

I am having an odd issue with two characters created by my players in my campaign. Both of them have a massive bonus on arcana and religion, despite it not adding up with their stats and proficiency. Example: Aether (lvl. 4) has 12 Int (+1) and proficiency in arcana due to the Sage background....his Bonus is a +7! Those are 4 points that are not accounted for. The other character has the same problem with a unaccounted bonus of +3.

I can't for the life of me figure out why. There is no homebrew involved that could cause this. I even changed stats and background  without success, the unexplained bonus is always there. There are no "customized" stats from what I can tell.

Are they by any chance clerics and choose the Thaumaturge Divine Order? They would get their Wisdom modifier added to Arcana and Religion (in addition to any Intelligence and proficiency bonus as usual). 

Oh man, you are absolutely right. I think I was distracted by the fact that the unexplained bonus was also on the druid. In my mind, that meant it had to be some sort of bug, when in reality Druids get a similar mechanic (Primal Oder: Magician). Thank you!

I totally agree, though, that the bonus could be better explained. When I click AC on my sheet I see a break down where the AC comes from citing the sources, while when I click on a skill, I just see the modifier. I think they could break down the boni. There are sources (good luck charm, the class features for cleric and druid), that are really hard to track.