Here is another question which again touches on the confusing UI design:
Regill comes equipped with a Gnome Hooked Hammer.
If you de-equip it and inspect it in the invtory, that is tagged as "Two-handed".
If you equip it, and hover over to get the tooltip out, then on the left-hand slot it says "Two-handed", and on the right-hand slot it says "One-Handed". BTW, Greater Pedantry check - one is with both words capitalized, the other with just the first word capitalized.
Regill has the feat "Weapon Finesse" which is described thus: "With a light weapon, elven curve blade, estoc, or rapier made for a creature of your size category, you may use your Dexterity modifier instead of your Strength modifier on attack rolls."
Even though the Gnome Hooked Hammer is not a "light weapon", hovering over Regill's attack bonus shows that he is getting the Dexterity, not Strength modifier. I guess this isn't a bug and there is a rules reason for it, but it's never explained as far as I was able to find.
I further don't understand why Regill's attack bonus calculates a "-2 [Two-Weapon Fighting]", although the Gnome Crooked Hammer is a single two-handed weapon. It's not like he breaks it in two parts and fights with two weapons.
I
guess this has to do with Regill's size and the fact he is wielding a two-handed weapon while being of small size.
This is what Spidergirl's UI looks like when wielding a two-handed weapon:
This is what Regill's UI looks like when wielding a two-handed weapon: