Horsetrading again

I don't understand what all the horsetrading is over the budget the government is trying to propose.
Didn't we just go through all this horsetrading when Netanyahu set up the coalition? They wanted money for x, y and z (each party according to its demands), Netanyaho offered, a, b, and c, and they agreed on m,n, and p. Is he not keeping the agreements he signed with the parties, so now they are renegotiating? He is keeping the agreements in the new proposal, but they want to change them?
What is this all about?