1099 WTHD_BASIS_AMT incorrect for some vendors

Hi - we are on FIN 9.2 PUM 12; tools 8.54. When we run the 1099 withholding posting job,  a handful of vendors have the wrong amount in the WTHD_BASIS_AMT field. the amount is over what it should be; and the difference always is the same as one of their vouchers. it appears the voucher is getting added to the withhold basis amount twice.

any advise would be greatly appreciated.

Celeste