Objects Going Through Floors

Whenever I make an object, be it a prop of any kind or a func_physbox, once I compile in-game it goes through the floor. What's stranger is that sometimes it does, and sometimes it doesn't. For example, when I first start the map it might, but then if I change teams or something it might not. It's entirely random. Any reasons as to why this is happening or how I can prevent this?

Perhaps you placed these entities too close to the floor? Try putting them a bit above it, perhaps that solves the problem...

yeh i know someone that had that problem and did what Captain P just said and it worked.

Yep, and I had that problem too, just raise the entity.

It already is about ten meters above the floor.

Are you using a length constraint somewhere too?

On some yes, I have them tied to a rope. On others, no, I have them free falling from the sky. (This is just a physics test.)