Pier and Beam Foundation Home Advise

Hello all! I'm looking at buying a home (near the heights) and unlike my current house, this house is pier and beam. Does anyone know how much shoring up foundation issues like this would cost? This looks sketchy quality on the work to me, but I'm no foundation expert – maybe someone here has the knowledge to tell me how serious these issues are? The location of these piers is on the inside of the house. The piers around the perimeter of the foundation look in good condition (not pictured here). Does anyone know how crucial the inner piers are to the overall structural integrity of the house?

The inspector also said there was pooling water underneath the house and the ground looks like clay if that information helps and is relevant. One other piece of information is that the house seems to be decently level throughout so perhaps the foundation "looks" worse than it is? Thanks in advance!