Difference between withholding compliance and backup withholding?

[Anonymous]

Any IRS people out there who can explain this to me? I was put in the withholding compliance program in Dec, which was fine -- I work on 1099s and never estimate quite what I'll owe at the end of the year. So now the IRS just takes extra money from DH's check. But just now I logged onto my savings account and an alert popped up: "Have you recently been placed in a backup withholding program by the IRS? Please answer these questions or be subject to additional IRS penalties." I didn't know how to answer since these two programs don't seem to be the exact same thing -- but I am also pretty clueless and it's surely not a coincidence??