Hello,
I am having the same issue. I went to the includes/languages/english/meta_tags.php file and put in my keywords/description there. When I go to check the source, my description and keywords are the same and they aren't the keywords/descriptions that I put in the meta_tags.php file. I am a little confused about the module meta_tag.php file too. Am I supposed to do something with that or not. Sorry. Any suggestions are appreciated.