This is not related to withholding from your benefit payments, this is about new SS tax withholding from your part-time job paycheck.
There are two issues that can cause "too much social security." One is if your total social security withholding from your job (W-2 box 4) is more than $8230. The other issue is if box 4 is more than 6.2% of box 3. Turbotax seems very sensitive to rounding this year. For example, if your wages are $9232, your SS tax should be $578.58. Turbotax will round that up to $579 and then report that as "too much SS tax withheld".
Double-check your W-2 that all the numbers are correct. If you still get the error message, try reducing the box 4 amount by $1. It should clear the error and won't create a problem with the IRS.
