Looks like a screw is missing that would tighten down and hold tension on the track that bar slides upon.

Look around the ground in that area. The movers might have loosened it and then it fell on the ground while the door was swinging in the wind.

If it is really bothering you and you are on a budget, you could cover it with an epoxy. Diy kits are not that expensive and do not look difficult to install. As you are basically painting the current countertop.

Another suggestion if that is stone, is to get a stone sealer compound and reseal it. Floor & decor as well as similar stores that specialize in home remodeling could give good advice on what specific product you need.

I did a cement top for my bathroom vanity. It turned out amazing, but I shudder to think how heavy a full kitchen countertop is.

Also it's much harder to keep clean than a traditional countertop material.

Looks like lots of good advice here already.

Idk how handy you are, but tile/grout was not nearly as hard to do as I expected. It just takes a long time to DIY this type of project. But it is immensely satisfying to answer "I did that" when someone compliments your finished work.

The only tool you might need that is not something most homeowners have is a wet saw. I bought a cheap one for almost the same price as renting a nice one for a weekend. And it has helped me do two bathrooms and soon my kitchen.