dunstvangeet
Explorer
I have a human 1 Rogue 1 Fighter with a +6 to Thieves' Tools (18 Dex). With expertise in Thieves' Tools that changes to +8, so it does appear to be working as intended. Expertise doubles the Proficiency Bonus, not the entire score.
+4 (18 Dexterity) +2 (Proficiency Bonus without expertise) = +6
+4 (18 Dexterity) +4 (x2 Proficiency Bonus with expertise) = +8
I have a rogue 11 (swashbuckler), with expertise in Thieves Tools, Acrobatics, Stealth, and Slight of Hand. Proficiency of +4, Dexerity of +5. So, proficiency should have a +9, with expertise getting it upto +13. Currently, on CS1, it is showing a +9. Found out the difference. Apparently, it was slightly misspelled (I have no clue how it was misspelled, but it was). Redid the Start page, and it showed the +13. So, I have no clue what the difference was.
*mutters about other things*
So, this apparently does work.