Unity Character sink through floor quick fix

Today I faced one of the weird problem where after I place a character controller on my character and putting in walking script it sink through the floor

Anyway

Here is a quick solution

Please notice that under your Character Controller property there are

Radius: 0.5
Height: 2

I found that if you just change the Height from 2 to 1, your character won't fall anymore, I dunno why, if any pro out there can understand please explain to me, but it will fix the problem anyway