Heroku Caching

There seems to be a problem with the caching. Caching is used to kick users out of the program (in other words, reset the program) after 10 minutes since users don't have to sign up/log in. But, for some weird reasons, the program resets after users pick a photo. This doesn't happen when I run the program locally, so I'm guessing Heroku is messing with the cache.