Was this countertop stabilized properly?
What you're actually looking at are drywall clips. They are used to patch holes in drywall by supporting the patch to the existing wall.

Here's what they look like before being bent and used incorrectly.



The counter wasn't designed for this unit. My concern is that those screws are in drywall and will pull out. Definitely don't sit on that counter or put anything heavy on that edge. This should be fixed right before someone gets hurt.