Why did this happen - because October 11th is the date when the U.S. Bureau of Labor Statistics releases its report of inflation. Social Security uses the Bureau of Labor Statistics’ Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) as their measure of inflation.
Cost of Living Adjustment (COLA) is Social Security's term for inflation. Social Security uses the CPI-W to determine if an adjustment is needed to Social Security benefits.
(Note: Social Security benefits do not go lower if inflation decreases)
You can read the official press release from Social Security here: https://www.ssa.gov/news/press/releases/2018/#10-2018-1
Contact your Baron Team for more information on social security benefits.