Share 'Bar Molding Defect'

I am new to The Chocolate Life and would appreciate the group's thoughts on this recurrent problem I'm having with bar molds. I have attached a couple of pictures of recent snafus. After filling my well-cleaned polycarbonate molds with precystallized dark chocolate (from Guittard), I place them in the refrigerator for around 10-15 minute and then place the molds at room temperature for a few hour…