It may be possible that you have too much in SS tax withheld if you had made more than $127,200 in 2017. Once you hit $127,200 in income, you should not have to pay SS tax on any additional amount.
Example: In 2018, you worked at company A and earned $70,000 before you switched employers. At company B, you earned $65,900.
Social Security taxes would be withheld from the $135,900 you earned in 2017, but the maximum taxable earnings for the year are only $127,200.
You would claim a refund of the Social Security taxes withheld from the last $8,700 in earnings when you filed your 2017 personal income tax return with the Internal Revenue Service (IRS).