title: My Heroku app seems to be running more than 1 instance
body: <p>As the title says, I have an app hosted on Heroku that seems to have more than one instance running.  This is a problem because I am trying to keep track of single letter posts on a GroupMe in order to see if they spell anything.  I am using python and a global string variable that I can add the characters to.  Since there is more than one instance, there is more than 1 global variable so sometimes the character gets added to one or the other which defeats the purpose of the program.  Has anyone else run into this problem or found a fix to this?  Thanks.</p>