You removed a load bearing wall they had reinforced the post and put in a beam 2 months later you are noticing cracks in the wall and a previous crack had lengthened what are my walls saying?

If I am reading the question correctly, a load bearing wall was removed and replaced with a beam? Clear span, no post in the middle? If cracks are appearing, the beam that was used was not big enough. For any space of 8 feet or more, 2x12 and plywood should be used for the beam or an engineered truss used.