Problem when move by velocity rigibody

in this first picture.
Red is player, Blue is first ground, Yellow is second ground.


When i put second ground next to first ground, i can move normal and have no problem when i move Player by Velocity in Rigibody2d.

But when i move second ground into deep first ground, my player get stuck like this picture. Althrought Y
of 2 ground is equal.


All objects use BoxCollider2D
Please help me!