This study examines the application of the General Principles of Good Governance (AUPB), particularly legal certainty and due care, in State Administrative Decisions concerning land measurement in Indonesia, with a focus on inconsistencies in administrative reasoning. While AUPB is formally recognized as a normative standard guiding administrative action, its practical implementation remains fragmented and often fails to ensure consistent decision-making. Employing a normative juridical method with case, conceptual, and comparative approaches, this research analyzes Decision No. 39/G/2025/PTUN.JKT and Decision No. 132/G/2025/PTUN.BDG to identify patterns of inconsistency in administrative and judicial reasoning. The findings reveal that contradictory legal reasoning and inadequate verification of factual and juridical data constitute violations of AUPB, undermining the legitimacy of administrative decisions and generating legal uncertainty for rights holders. These inconsistencies reflect not merely procedural deficiencies but structural limitations in the Indonesian administrative law framework, which predominantly relies on reactive judicial control rather than preventive governance mechanisms. By comparing Indonesia with the United States administrative law system, this study highlights the importance of structured reasoning standards and ex ante procedural safeguards in ensuring accountability. The novelty of this research lies in reconceptualizing administrative inconsistency as a systemic doctrinal issue and proposing the integration of technology-based verification and digital traceability as mechanisms to operationalize legal certainty and due care. The study contributes theoretically by bridging the gap between AUPB as a normative principle and its application in adjudication, and practically by offering policy-oriented recommendations to strengthen consistency, transparency, and accountability in land administration.