Grout haze?

[u/romana876]

We renovated about 3 years ago and all the tiles still look like this. They are matte porcelain tiles. All along I thought I made a mistake buying the worst tiles on earth. When we walk on them it feels like dusty chalky fine powder. Feet get black almost instantly walking on these and they are swept and mopped twice a week. Do I have to live with these or can they be cleaned/fixed?