Query String added more than once /?cn-reloaded=1&cn-reloaded=1

Hi,

I use this cookie notice plugin with reloading enabled and with W3 Total Cache Plugin.

I detected in google analytics that multiple pages in my wordpress site are showing that the Query String cn-reloaded=1 is being added more than once like this:

/?cn-reloaded=1&cn-reloaded=1
/?cn-reloaded=1&cn-reloaded=1&cn-reloaded=1
/?cn-reloaded=1&cn-reloaded=1&cn-reloaded=1&cn-reloaded=1

Sometimes the query strings appears only once, and sometimes even more.

I notice that if I input it more than once in my browser it redirects to just one repetition /?cn-reloaded=1

The question is, why is this happening?

What does it mean to be showing multiple of the queries?

How detrimental is this for site performance and user usability?

Lastly, how do I fix this so the page URLs look and behave much clear (only one query string)?

thanks!