Sorry I also did not see your reply…
I have done some testing and have found where the error is occurring, there is an error in selecting the representative ensemble hydrograph when RORB runs ensemble using temporal patterns that span different AEP bins, (e.g. frequent, intermediate and rare). This doesn’t affect the individual simulations themselves but as you had found there is an error when selecting the representative hydrographs. I will make sure that this is addressed in the next release.