I suspect you should set all the labels' Caption properties to vbNullString as you do with lblscore
Code:
frmviewscore.lblscore.Caption = vbNullString
frmviewscore.lblstarsearned.Caption = vbNullString
frmviewscore.lbldisplayscore.Caption  = vbNullString
before the For loop in the lstusers_Click event.