Clearblue Digital Advanced Test problems..


So I recently have been using one digital holder for my tests all week and been getting flashy smiley, and I had to get a new one now I got a blank circle... what the heck has happened? Is this because of me using a new test and new holder or what? I’m so confused.. below is my picture of my last test with a smiley before buying the new one. If I need to use my old holder can I use the new test strips on it?