Incorrect UBR/UER at detail level / project level shows $0 - root cause ? How to fix?

I have a project which had revenue generated prior to invoicing and it created a credit balance in the UER account.  See below, on Mar 5, we created an event for 109671.76, prior to that, to date we had UBR balance 960 and UER balance 0.  After that revenue run, UBR shows what should have been the prior balance and UER has a -108,711.76; under what conditions would this happen and how do we fix, as now pa_projects_all shows UBR/UER as $0, but if I roll up the detail level, it shows -108711.76 in both?  Thank you.

TYPESEQNUM UBR  UER PUPD