Ice cubes melt together

Question

After the ice tray fills with water, a trickle of water drips into the
left rear corner of the ice bin and freezes most of the cubes together.
I can't tell if the tray is overfilling or if there is a leak. The
refrig is 18 months old. I attempted to level the ice tray but that
didn't help. The temp never goes over 0 degrees F.