That's exactly what I expected to see. The VM has an active snapshot dated Feb. 2nd and instead of adding the snapshot (...-000001.vmdk) you added the base disk, which resulted in loosing the deltas in the snapshot file. Although it would now be possible to re-chain the second virtual disk's snapshot file to the base disk, this would most likely result in data corruption and since you have a backup which can be restored, I'd suggest you go this way.
What you should do to cleanup, is to use the Snapshot Manager and "Delete All" snapshots, which will merge the deltas of the first disk to its base disk. The second disk's snapshot file - which is now obsolete - will not be merged and can basically be deleted from the datastore (or moved to a sub-folder and deleted later on as a precaution).
Please take a look at http://kb.vmware.com/kb/1015180 to see how snapshots work in VMware products.
André