This can occur when you have offer credits revoked... check your account for offers with "Denied" status...
None of my offers has Denied Status,
They all say approved!
I think the problem lies with one of the surprise promotions by kohler.
where I was miss-calculated in my surprise winning total. I was shorted $1
then kohler corrected the error. It was showing as approved in the accounts colume
but was never added into the total in my account.