ASEAN's response to the 2025 Myanmar earthquake (M7.7, over 5400 deaths) produced a compliance-harm paradox: rapid political coordination, record DELSA deployment, and procedural compliance coexisted with 74 per cent of the worst-affected townships lacking shelter assistance seven weeks later, continuing airstrikes, and politically directed aid. This article develops an embedded normative tension framework, bridging constructivist and practice-attentive institutional analysis, to explain why institutional success and humanitarian failure were structurally co-produced. AADMER incorporates sovereignty-procedural and humanitarian-needs-based norms that coexist compatibly under stable conditions but become irreconcilable under compound emergencies—when the affected state is itself a source of humanitarian harm. Three practice-mediated mechanisms locked in sovereignty-procedural dominance: institutional channelling via the National Focal Point, the post-Nargis depoliticisation constraint, and the consensus veto compounded by intra-ASEAN fragmentation. The ASEAN Chair's resort to bilateral improvisation outside AADMER confirms the architecture's structural inadequacy, revealing this paradox as an enduring feature of sovereignty-centric disaster governance.