Probate of a will can be contested under certain grounds. In these cases, proceedings move from probate to district court. The primary reason for someone to contest a will is that they feel the will is invalid. There may also be competing versions of a will, and no clear answer as to which may be the most valid one. Aside from a will being contested, beneficiaries may also be in dispute. Or, there may be so many claims that the estate cannot possibly cover the costs of all of them.