I am designing a first aid kit in blender, and I have a foam insert that has booleans/holes in it for items inside the kit so it fits snugly. I have made 6 out of 8 boolean operations successfully, but 2 of them, after applying boolean modifier, do not create a boolean of any kind. But when I go to edit mode it shows on the topology the outline of my boolean. This is pretty weird,has never happened to be before.
The knife tool does work, but it does not yield the result i want and is not as smooth.

