I paid my 40 quarters, why is my social security benefit reduced?

Title: I paid my 40 quarters, why is my social security benefit reduced?

Article Snip: "...While your annuity cannot be reduced, any Social Security benefit you are entitled to will be affected by the Windfall Elimination Provision. The WEP reduces that benefit if you have fewer than 30 years of substantial earnings under Social Security. For a full explanation of the WEP and how it will affect you, go to https://www.ssa.gov/pubs/EN-05-10045.pdf . ..."

Reference: www.federaltimes.com
Social Security,Windfall Elimination Provision (WEP),

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