Plugin breaks admin section?? I don’t know why?

So when I install a plugin and activate it in the admin, everything is fine. However, when if I go back and edit/hack that same plugin something happens and the plugin admin section is all messed up. I can see all of the code within the plugin directly on the plugin admin page.

The plugin still works fine, the plugin admin section is just messed up. I can upload a screenshot if someone can’t understand this.

Any help would be awesome!