MioKontic: HP - are you sure it actually removes them from the list?
Yes, I am sure, but only if you delete them using the app (only). If you try deleting them via the webpages, they are removed as friends (as can be verified on the app) but they still appear on your profile page and, yes, if you go to their page, it still has the "remove friend" option.
The only way to fix it, if you deleted from the webpage, would be to go into the app, add them as a friend, and then delete them (again) using the app.
The protocols reflect WGT at its finest.
EDIT: Sham, jump in if you have anything to add or correct.