one cookie cannot deleted permantly

When deleting cookies the cookie "s.uicdn.com" is only temporarily gone, when rechecking the cookies it appears again.

The computer is not connected to the internet while deleting - so the cookie is stored somewhere.

Any ideas to delete this permanently, please?

What symbol is shown in the bottom of the tools>cookies tab when you highlight s.uicdn.com

Thank you, Nergal

I did upgrade from CC v5.25 to v5.26 and then I could delete the coockie permanently.

I also discovered that I caught this coockie when I tried to reach

" https://secure.piriform.com/ " but then the website

" https://support.cleverbridge.com/hc/de/requests/new?ticket_form_id=18434 "

opened.

Problem solved - thanks again.