2 つの異なるサイトを読み込もうとすると、Ubuntu 16.04 サーバーが間違った MySQL データベースを選択するのはなぜですか?

Question

I have an Ubuntu 16.04 server that I am hosting two websites on.

However I keep getting an Internal server error most of the times that I try to access the sites.

Each time I access the error file (/var/log/apache2/error.log) I can see that the mysql database is trying to access the correct table for the desired site. However it is using the wrong database.

For example this is my latest error;

[Mon Jun 19 14:37:22.765613 2017] [wsgi:error] [pid 1683] [client 91.143.79.131:50212] pymysql.err.ProgrammingError: (1146, "Table 'validation_server.articles' doesn't exist"), referer: http://tracker.txfmedia.com/
[Mon Jun 19 14:37:22.765630 2017] [wsgi:error] [pid 1683] [client 91.143.79.131:50212] , referer: http://tracker.txfmedia.com/

'validation_server.articles' doesn't exist代わりにアクセスしようとしていることがわかります'stories.articles'

何か間違ったことをしているのでしょうか?