Sometimes there are clear reasons, such as a foster calf that was recorded separately.
Other times aren't as clear. For example, if you needed to use DNA to determine the dam, you might have submitted the calf without a dam listed to identify its correct dam. Once the dam information is corrected, the calf won't automatically be reassigned to the larger group.
Or another example, if you sent something in as an ET calf and after DNA, found out it was actually a clean up sire with a registered recipient and had it corrected.
In either case, the calf won't automatically be reassigned to the larger group.
You'll need to contact the Association to make the adjustment, and they are very helpful in resolving these issues.
Click here for a reminder on how groups are split.