Hmmm... that's odd.
Should created the DB exactly as it was at the time of the backup. Nothing else going on? No reverts from snapshot? No data obfuscations being run?
Can you repo this on a different database?
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability