My jurors can't see specific art pieces after clicking on a call

Jurors will only see entries with status "Show to Jury".

Click into the call as a logged in  Admin and use the drop-downs to the left of each entry to set the entry status to "Show to Jury".

Also, make sure you have assigned the jurors to that call. In the settings of the call, you should see the option to check all the jurors who are live on your account. Check the ones you want to juror and hit save.