During a graphical install on a new system with 2 new, blank harddrives diskdruid installed new partitions always on the second drive, it doesn't matter which drive is selected for partitioning. The swap partition could be created on the first disk.
First, were you selecting the specific drive to create the partition on in the "Add" dialog? If you were, was Disk Druid still putting them on another drive? There is a new feature in the installer which will put partitions on the drive with the most free space, so if you are not specifying which drive to place the partitions on, they can land on the second drive only if it is significantly larger than the first drive.
In the lab today, we had a situation where no matter what we told the installer, it would place the root partition on the second driver no matter what. This was becuase there was more space on the second drive. We are going to fix this problem and hopefully that will fix yours as well. Unfortunately this change will not make it into beta3.
Issue is resolved in the next cut of the beta.