The discrepancy between electron–positron cross-section data and lattice Quantum Chromodynamics determinations of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment is shown to arise from topological suppression in a fixed-point Type IIB string compactification. Two Kähler blow-up moduli stabilize at the values τs1 = 220 and τs2 = 12.4, defining a geometric hierarchy ε = τs2 /τs1 = 0.056. Worldsheet topology and moduli-space curvature suppress the effective hadronic vacuum polarization amplitude relative to flat-space lattice computations. The resulting suppression factor Rg−2 = exp(− κλ/2ε) = 0.967 matches the observed ratio between electron–positron and lattice determinations. No new particles or supersymmetric states are required