Random columns creating itself

Hello.

Been using this plugin for a while now, but something weird is happening with it. Each time I go to display the submitted data within my WordPress Admin Panel, I see that apart from the contact-form-7 fields I created for my contact form, bunch of other columns are created with totally random data in it.

Please see the image I uploaded: http://s22.postimg.org/yx0eznrch/random.jpg (I circled the questionable columns).

How can I fix this?

https://wordpress.org/plugins/contact-form-7-to-database-extension/