Dave R,
Thanks for your quick reply. I know I should've avoid creating multiple faces. But i did it (and I do it accidentally sometimes), and wanted a method to fix it. But if the only method is avoiding it in the first place, then i'll redraw most stuff..
Answer on your question is: I created component 1 with pushpull and created 2 with ctrl + pushpull. Don't know why. Still need to learn working disciplined with sketchup