Larian-- You must have programmed some rider on die rolls when players are rolling.
Ive noticed that as Im paying though (im in underdark atm) that my most frequent attack roll is 1-4 on a 20 sided die- and that with +6 to hit.
No joking here.
I can be behind an enemy, show 72% to 92% to it and I will constantly roll 1-4.
Ive learned to save the game after every succesful atk roll, because I literally miss 90% of my attacks.
On the flip side-- enemies rarely if ever miss me.
My ranger has defensive dueling, wears +1 scale, and has 17 dex. That makes my AC 19 when attacked with melee weapons.
Now I dont mind getting hit every now and then, but when monsters hit me 90% of the time for 20-30 damage- its a no win unless you save after every single player/mob attack.
Please look into these die rolls you programmed-- there is something wrong.