Duplicated modules in Magento?

Well, I just lost half of hour trying to find the reason why my module gets duplicated on one of my pages. I was preparing some materials for a seminar I’m holding few days from now, when I got lost trying to solve the issue of my module being duplicated on one of pages I assigned it to.

Just in case some of you got into the same situation, let me save you some trouble. Golden rule, do not forget to assign a name to a module. Will save you some headache.

I provided my screen shot below for you to see what I’m talking about.