The Cosmic Microwave Background exhibits gravitational lensing caused by massive structures between us and the CMB surface of last scattering, and observations show that the amplitude of this lensing effect is larger than Lambda-CDM predictions based on the standard matter distribution and the assumed growth of structure over cosmic time. The lensing power measured from multiple independent CMB datasets appears to exceed what the model expects by approximately 10-20 percent depending on the analysis, with some measurements showing the amplitude parameter A_lens reaching values around 1.1-1.2 when the standard model predicts unity (Planck Collaboration 2018; van Engelen 2015). Lambda-CDM struggles to explain this excess lensing amplitude because the model predicts specific amounts of matter (both ordinary and dark) at each epoch of cosmic history based on inflation and structure growth, and either there is more matter between us and the CMB than predicted, or the matter is more densely concentrated in structures that lens more effectively, or some unknown mechanism is enhancing the lensing effect—all of which challenge the model's consistency.