PROBLEM WITH ACCESS

If  I  try  to  access chordie  on my  kindle  fire  I  get  a message  saying  my  connection isnt  private and attackers may be  trying  to  steal  info, it says the server presented  a weak signature algorithm  which means security credentials may be forged  yet with my  pc  there is  no  problem  .i can bypass and proceed to chordie on the kindle but i dont know whats going on