Why is the Hit event of an explosion returning distances greater than its blast radius?

So I have a tank that fires grenades, and I have the grenade damage based on the distance the explosion center is from a humanoid, but for some odd reason, the distance parameter of the Hit event returns distances that are greater than the blast radius of the explosion itself. I even got values that were twice as large as the blast radius of the explosion itself. Is there any reason for this? Please help.

Here's the main grenade code:

Grenade.Touched:connect(function(Obj)
    if (not Obj:IsDescendantOf(Char)) and (not grenadeHit) then
        grenadeHit = true

        expSound:Play()

        local Explosion = Instance.new("Explosion")
        Explosion.BlastPressure = grenadeExplosionPressure --This is 50000
        Explosion.BlastRadius = grenadeExplosionRadius --This is 15
        Explosion.DestroyJointRadiusPercent = (grenadeRangeBasedDamage and 0 or 1) --This is currently set to 0
        Explosion.ExplosionType = Enum.ExplosionType.NoCraters
        Explosion.Position = Grenade.Position
        Explosion.Hit:connect(function(Obj, Dist)
            local hitHumanoid = (
                Obj.Parent:IsA("Accoutrement") and findFirstClass(Obj.Parent.Parent, "Humanoid")
                or findFirstClass(Obj.Parent, "Humanoid")
            )
            if hitHumanoid then
                createCreatorTag(hitHumanoid)
                if grenadeRangeBasedDamage then
                    local distFactor = 1 - (Dist / grenadeExplosionRadius)
                    local baseDamage = distFactor * grenadeDamage
                    if Obj:FindFirstChild("damageMultiplier") then
                        print(distFactor) --This prints negative numbers for some reason
                        hitHumanoid:TakeDamage(baseDamage * Obj.damageMultiplier.Value)
                    else
                        if Obj.Name == "Torso" then
                            hitHumanoid:TakeDamage(baseDamage)
                        end
                    end
                end
            end
        end)
        Explosion.Parent = workspace
        wait()
        Grenade:Destroy()
    end
end)

Thanks!