Thank you Tom! I thought I was going crazy. LOL
I must have enabled drop frame when creating the new project without thinking about it. I always work without drop frame enabled. I created a new project with drop frame disabled and copied and pasted that same footage in the new project, created the compound clip and everything is the same, inside and out. So that was the problem.
Edit: I also changed the drop frame setting in the project and that is also correct now. I did enable drop frame when creating it.