I don't know if it's the character sheets or what but the formulas for our weapon strikes and skill checks are way off. My character is a homebrewed drunken brawler. He has proficiency in unarmed strikes and has a Strength of 18. So he should have a +6 to hit. Yet whenever I roll using STR as the stat it always rolls a D20 +3. When I roll an Acrobatics check (something he's proficient in. Also he has a Dex of 17) it should be a d20 + 5 but instead it's a d20 +6 in the formula. It's not just me, every player in our session has had their rolls off by a few numbers. What could be causing this? Is it a setting my DM put on or is it the character sheets? Please help!