problem stays on Screens a while even if after problem resolved

Steps to reproduce:

1. Create screen like below without specifying any Host.
   
2. Tigger a problem(in our test, it's [trigger_test])
   
3. Close the problem and you could see it is still staying on the screen which Created in first step, but you also could see it disappeared from 「Host:CCC」's Screen.
   It means this only happens when several problems on the Issue status.
   
   Expected:
   problem should be disappeared on the Screens after problem resolved.