Tax Groups Dropping during processing

For the last two months when processing running single action on bills created from templates we have lost our tax group data.  We checked the bills before running single actions, but when the process is done the groups are missing and the tax calculated incorrectly.  We use Vertex for the tax calculating and are running Billing 9.0.  I don't see any SR's created on the topic, so has anyone else experienced this issue?

Thanks in Advance -

Justin