Collect URL parameters

Hi.
I have made photo contest, and checked Collect URL parameters.
Also added allow keys: id, mail, order.
But when testing with incognito url with i.e. ?order=12333
Then i can see the parameters in the Admin for the uploaded pictures i did in incognito.

What am I missing?

I do not really understand, incognito mode does not remove URL parameters. Please describe in more detail what you want to do.