Collision shapes not working

I have a problem with collision shapes. I deleted the box collision shape and made a polygon collision shape. But when I click on the polygon shape a box shape appears around it also. So when actor collides to the left side of my igloo the collision can happen in the empty space in the top left corner ( see picture two).

Have you actually tested your collisions are happening as a rectangle instead of your polygon's shape?

Yes I have tested and the collision happens in the rectangle so right now the polygon shape is useless. How can I fix it?

Clicking the polygon always shows the full rectangle on top of the polygon as a selection area. That's only for display purposes within that window, it has no real effect on the actual collision boundaries. In other words, I cannot replicate your issue. You can check the collision bounds in-game by going to Run > Enable Debug Drawing. If there is an actual rectangle box, its origin lies somewhere else.

Make sure the vertices are defined in counter-clockwise order.