Prefabs won't appear in builds.

So, this is my scene. The white, green and red walls are all prefabs, including my diagonal tile. When i built the projects, this was never an issue. I had do redo 2 prefabs: the diagonals (triangles). After doing this, the app didn't have any of the triangles. It had everything else but the 2 prefabs I edited. (In the editor everything was fine, of course). I deleted the buggy prefabs and made other 2 prefabs (with the same name) but they still don't show up in the game. This is built for Android as well.

Is there any way I can check why my prefabs aren't showing up? I made a new scene, put the prefabs there. Nothing. I changed the build order and restarted unity. The only thing that may be causing this is that it has the same name. So, anyone has got an idea?

Update: added other prefabs. They build correctly. The triangles STILL don't want to appear! Update2: created a identical copy (but not a prefab) and that works, apparently. Still want to know why the prefabs don't want to show up.