Recently when I am working on one project I observed strange behavior. The module is there in the modules directory but I can’t see that module in the admin/build/modules/list page. I wanted to enable that module but I could not find that module in the list.
I was struggling to find out why? After some time one of my colleague said to search for this module .module file exist in some other location also. Yes it is there in another folder. If I remove that extra .module file which is there at wrong location it appear in the modules list page.
.module file should exist at only single palce. This probllem can be common when we use ftp to copy files. By mistake we can put files in some other location. So be careful while copying files using FTP.