Trying to block bidders - not working

I have had several non payers recently, as Im sure everyone has : (


Trying to add them to my blocked bidder list, when I return to the list the ID I last put in, is not showing up, even though I am typing them in then pressing submit??


Instead of the ID,  weird numbers come up followed by the word "deleted"??


 


Sadly these days the list is getting longer and longer.......: (