Spwan object falls through Landscape.

Hello people! I have a problem with my Landsacpe. So I think. Because whenever I spawn an item then it falls through the ground. But only in certain places. Almost on every part of my’s landscape the item falls on the ground like I want it to.

Do you have any idea what this could be?

It’s the item.

Okay. I have tried everything in the settings. So far nothing has worked. Do you have a suggested solution?

Yes