I have a few questions:
Which dice option are you using? Is disadvantage at play? Or do you have screen captures/video?
I haven't got the faintest idea? I didn't know there were dice options? How would I tell? What's disadvantage? All I know is she casts bless on her first turn, which unsurprisingly is before my first turn, and no, I don't have the ability to record what I'm doing. The added problem is I have access to one and only one Trader right now and he has a grand total of 2 healing potions, and my Cleric can only cast two healing spells per fight. When the AI hits you for 25% (on average) health that's not close to being enough. I tried fighting the Hobgoblin, his first turn he one shots Gale, the Goblin healer then chucks a Molotov that one shots Wyl. The next turn they finish those characters off and the turn after that I'm one-shot again. How am I meant to play a game where the AI has twice my HP despite being a level below me, can one-shot me and I can't land a single hit on him? Sure that's an extreme example but it was the same with the other Goblins in the camp. I can't hit the broadside of a barn.
The dice options are in settings, under Gameplay. There is a spot that says weighted dice with a checkbox for on/off.
Disadvantage is going to take a bit of an explanation. D&D 5e has attack rolls attempt to meet an armor value (for example you may need to be the number 16). A 20-sided dice gets rolled and that number added with proficiency (+2) and modifiers (+X) will determine if you succeed. When you have disadvantage you roll two 20-sided dice and use the minimum roll, greatly reducing your chance of success.
TBH if you try to play by D&D 5e rules Larian is a cruel DM. Right now the game expects you to take advantage of Larian's Homebrew (superfluous Advantage/Disadvantage, unlimited rest, eating mid-combat, etc.) I consider forcing the player to use strategies from homebrew rules to be anti-fun and I hope Larian will see the light and drop the homebrew rules and let combat be fun.
A lot of the strategies from homebrew rules are unintuitive. They force the player to reload until they figure out the cheese. The game would be a lot better if the player got to use intuitive strategies for how to win combat.