Last year 2020 i maxed out my limit to what i had to pay in social security witholding, now it says i deferred the payments, help???

Your employer may have deferred some of your social security tax. Your social security tax withheld in box 4 on your W-2 form should be 6.2% of your social security wages reported in box 3 of your W-2. If it is less, then some of it was probably deferred because of Covid.