Why does big tools make players messed up?

Have anybody found a way to fix this? Here's an example of it:

https://twitter.com/RomDino/status/917732980025466880

Informations:

There are two parts in the tool. 1 is the Sword (Handle) and the other is the damage part so the giant can hit the tiny player.

Also on the forums I've tried making it Lighter or Lower Physical Properties. Making it unachored or unCollidable It will act like the same result.