BodyVelocity is putting the player into freefall whenever it runs into an anchored part?

basically, i'm trying to create rolling

i'm using BodyVelocity to make the player go forward, problem is that whenever i roll into something that's anchored, i go flying

local BodyVelocity = Instance.new("BodyVelocity")
BodyVelocity.MaxForce = Vector3.new(1, 1, 1) * math.huge
BodyVelocity.Velocity = RootPart.CFrame.lookVector * 50
BodyVelocity.P = 500
BodyVelocity.Parent = RootPart

https://gyazo.com/4fdbae4b7c3cc64eed723357aaa2137d