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We report precision mass measurements of $^{133}$Sb, $^{133g,m}$Te, and$^{133g,m}$I, produced at CARIBU at Argonne National Laboratory's ATLASfacility and measured using the Canadian Penning Trap mass spectrometer. Thesemasses clarify an anomaly in the $^{133}$Te $\beta$-decay. The masses reportedin the 2020 Atomic Mass Evaluation (W.J. Huang et al., 2021) produce$Q_{\beta^-}(^{133}$Te)=2920(6) keV; however, the highest-lying $^{133}$I levelpopulated in this decay is observed at $E_i=2935.83(15)$ keV (H.G. Hicks etal., 1983), resulting in an anomalous $Q_{\beta^{-}}^{i}=-16(6)$~keV. Our newmeasurements give $Q_{\beta^-}(^{133}\text{Te})=2934.8(11)$ keV, a factor offive more precise, yielding $Q{_\beta^i}=-1.0(12)$~keV, a 3$\sigma$ shift fromthe previous results. This resolves the anomaly and indicates the possibilityof an ultralow $Q$-value $\beta$ decay in this system.

Precise Mass Measurements of $A=133$ Isobars with the Canadian Penning Trap: Resolving the $Q_{\beta^-}$ anomaly at $^{133}$Te