ElectricalEel, It's even more comical when you think about this: You have a Gas Giant with a "meh" Gravity and then you find a Moon that orbits the Planet in 11 Times the Distance of Earth to the Sun. How is that possible? Gravity? Aliens? Illuminati? Half Life 3? It's ridiculous!
To the Moon-Collisions: Well, since they orbit the Planet in THAT Distance, they are probably a few Million Kilometers away from each other, so I doubt that they collide so easy with each other.
"Eins - Hier kommt die Sonne Zwei - Hier kommt die Sonne Drei - Sie ist der hellste Stern von allen Vier - Hier kommt die Sonne"
The mass of a planet isn't the only factor that influences the size of its Hill-sphere (the distance a moon can orbit it). Its distance to its sun is also very relevant; the farther away the sun, the larger an area is dominated by the planet's gravity. As a result, it's Neptune which has the furthest moon in our Solar System, not Jupiter (Neso, which reaches a distance of half a AU from Neptune and takes 27 years to orbit).