To delete a plugin, it’s best to use the built-in delete function (available after you deactivate a plugin), because that deletes other things like settings and databases, but I don’t think this is your problem.
The problem is most likely another plugin with javascript functionality in the admin. What you’re describing is what you’d see if the plugin javascript was not allowed to run properly. I’d suggest opening your development tools in your browser and looking at the console to see what errors there are.
You may need to deactivate plugins to see which one is causing the interference.
Thank you for the fast reply xnau! I checked the console window in my browser and it gave me the following errors:
Uncaught TypeError: Cannot read property ‘mozilla’ of undefined \\…/wp-content/plugins/participants-database/js/manage_fields.js?ver=3.9.2:31
Uncaught TypeError: Cannot read property ‘hasClass’ of undefined load-scripts.php?c=0&load%5B%5D=hoverIntent,common,admin-bar,svg-painter,heartbeat,wp-auth-check,jq…:246
(anonymous function) load-scripts.php?c=0&load%5B%5D=hoverIntent,common,admin-bar,svg-painter,heartbeat,wp-auth-check,jq…:246
jQuery.event.dispatch jquery-1.9.1.js?ver=1.0.0:3074
elemData.handle jquery-1.9.1.js?ver=1.0.0:2750
jQuery.event.trigger jquery-1.9.1.js?ver=1.0.0:2986
(anonymous function) jquery-1.9.1.js?ver=1.0.0:3677
jQuery.extend.each jquery-1.9.1.js?ver=1.0.0:648
jQuery.fn.jQuery.each jquery-1.9.1.js?ver=1.0.0:270
jQuery.fn.extend.trigger jquery-1.9.1.js?ver=1.0.0:3676
(anonymous function) load-scripts.php?c=0&load%5B%5D=hoverIntent,common,admin-bar,svg-painter,heartbeat,wp-auth-check,jq…:245
fire jquery-1.9.1.js?ver=1.0.0:1037
self.fireWith jquery-1.9.1.js?ver=1.0.0:1148
done jquery-1.9.1.js?ver=1.0.0:8074
callback
So I have no clue what is causing it but ill go disable my plugins now one by one to check which one is causing it.
*UPDATE: Found the plugin what was causing it! Deleted it and works fine now. Thank you for the help!