Something Ain’t Right
This isn’t as much of a DIY problem as it is a sight for sore eyes, so in that case, yes, in a sense, it is a DIY problem. This person installed tiles (that look beautiful, by the way) in such a way that they don’t sit parallel to the carpet in the next room.
The grout shows that come in at an angle and that the tile next to the carpet will shrink the more it goes down. The sad part is that taking out these tiles and installing new ones is going to cost the homeowner quite a lot. That’s why you shouldn’t DIY everything, guys.